diff --git a/oviewer/document.go b/oviewer/document.go
index f2074dd0..0acf2706 100644
--- a/oviewer/document.go
+++ b/oviewer/document.go
@@ -113,7 +113,7 @@ func NewDocument() (*Document, error) {
 			ColumnDelimiter: "",
 			TabWidth:        8,
 			MarkStyleWidth:  1,
-			PlainMode:       true,
+			PlainMode:       false,
 		},
 		lastContentsNum: -1,
 		seekable:        true,
diff --git a/oviewer/help.go b/oviewer/help.go
index 8f23ac03..01f580cf 100644
--- a/oviewer/help.go
+++ b/oviewer/help.go
@@ -1,6 +1,8 @@
 package oviewer
 
 import (
+	"bufio"
+	"bytes"
 	"fmt"
 	"io"
 	"strings"
@@ -29,99 +31,16 @@ func NewHelp(k KeyBind) (*Document, error) {
 
 // KeyBindString returns keybind as a string for help.
 func KeyBindString(k KeyBind) string {
-	var b strings.Builder
-	fmt.Fprint(&b, gchalk.Bold("\n\tKey binding\n"))
-	fmt.Fprint(&b, "\n")
-	k.writeKeyBind(&b, actionExit, "quit")
-	k.writeKeyBind(&b, actionCancel, "cancel")
-	k.writeKeyBind(&b, actionWriteExit, "output screen and quit")
-	k.writeKeyBind(&b, actionWriteBA, "set output screen and quit")
-	k.writeKeyBind(&b, actionSuspend, "suspend")
-	k.writeKeyBind(&b, actionHelp, "display help screen")
-	k.writeKeyBind(&b, actionLogDoc, "display log screen")
-	k.writeKeyBind(&b, actionSync, "screen sync")
-	k.writeKeyBind(&b, actionFollow, "follow mode toggle")
-	k.writeKeyBind(&b, actionFollowAll, "follow all mode toggle")
-	k.writeKeyBind(&b, actionToggleMouse, "enable/disable mouse")
-
-	fmt.Fprint(&b, gchalk.Bold("\n\tMoving\n"))
-	fmt.Fprint(&b, "\n")
-	k.writeKeyBind(&b, actionMoveDown, "forward by one line")
-	k.writeKeyBind(&b, actionMoveUp, "backward by one line")
-	k.writeKeyBind(&b, actionMoveTop, "go to top of document")
-	k.writeKeyBind(&b, actionMoveBottom, "go to end of document")
-	k.writeKeyBind(&b, actionMovePgDn, "forward by page")
-	k.writeKeyBind(&b, actionMovePgUp, "backward by page")
-	k.writeKeyBind(&b, actionMoveHfDn, "forward a half page")
-	k.writeKeyBind(&b, actionMoveHfUp, "backward a half page")
-	k.writeKeyBind(&b, actionMoveLeft, "scroll to left")
-	k.writeKeyBind(&b, actionMoveRight, "scroll to right")
-	k.writeKeyBind(&b, actionMoveHfLeft, "scroll left half screen")
-	k.writeKeyBind(&b, actionMoveHfRight, "scroll right half screen")
-	k.writeKeyBind(&b, actionGoLine, "go to line(input number)")
-
-	fmt.Fprint(&b, gchalk.Bold("\n\tMove document\n"))
-	fmt.Fprint(&b, "\n")
-	k.writeKeyBind(&b, actionNextDoc, "next document")
-	k.writeKeyBind(&b, actionPreviousDoc, "previous document")
-	k.writeKeyBind(&b, actionCloseDoc, "close current document")
-
-	fmt.Fprint(&b, gchalk.Bold("\n\tMark position\n"))
-	fmt.Fprint(&b, "\n")
-	k.writeKeyBind(&b, actionMark, "mark current position")
-	k.writeKeyBind(&b, actionRemoveMark, "remove mark current position")
-	k.writeKeyBind(&b, actionRemoveAllMark, "remove all mark")
-	k.writeKeyBind(&b, actionMoveMark, "move to next marked position")
-	k.writeKeyBind(&b, actionMovePrevMark, "move to previous marked position")
-
-	fmt.Fprint(&b, gchalk.Bold("\n\tSearch\n"))
-	fmt.Fprint(&b, "\n")
-	k.writeKeyBind(&b, actionSearch, "forward search mode")
-	k.writeKeyBind(&b, actionBackSearch, "backward search mode")
-	k.writeKeyBind(&b, actionNextSearch, "repeat forward search")
-	k.writeKeyBind(&b, actionNextBackSearch, "repeat backward search")
-
-	fmt.Fprint(&b, gchalk.Bold("\n\tChange display\n"))
-	fmt.Fprint(&b, "\n")
-	k.writeKeyBind(&b, actionWrap, "wrap/nowrap toggle")
-	k.writeKeyBind(&b, actionColumnMode, "column mode toggle")
-	k.writeKeyBind(&b, actionRainbow, "column rainbow toggle")
-	k.writeKeyBind(&b, actionAlternate, "alternate rows of style toggle")
-	k.writeKeyBind(&b, actionLineNumMode, "line number toggle")
-	k.writeKeyBind(&b, actionPlain, "original decoration toggle")
-
-	fmt.Fprint(&b, gchalk.Bold("\n\tChange Display with Input\n"))
-	fmt.Fprint(&b, "\n")
-	k.writeKeyBind(&b, actionViewMode, "view mode selection")
-	k.writeKeyBind(&b, actionDelimiter, "column delimiter string")
-	k.writeKeyBind(&b, actionHeader, "number of header lines")
-	k.writeKeyBind(&b, actionSkipLines, "number of skip lines")
-	k.writeKeyBind(&b, actionTabWidth, "TAB width")
-	k.writeKeyBind(&b, actionMultiColor, "multi color highlight")
-	k.writeKeyBind(&b, actionJumpTarget, "jump target")
-
-	fmt.Fprint(&b, gchalk.Bold("\n\tSection\n"))
-	fmt.Fprint(&b, "\n")
-	k.writeKeyBind(&b, actionSection, "section delimiter regular expression")
-	k.writeKeyBind(&b, actionSectionStart, "section start position")
-	k.writeKeyBind(&b, actionNextSection, "next section")
-	k.writeKeyBind(&b, actionPrevSection, "previous section")
-	k.writeKeyBind(&b, actionLastSection, "last section")
-	k.writeKeyBind(&b, actionFollowSection, "follow section mode toggle")
-
-	fmt.Fprint(&b, gchalk.Bold("\n\tClose and reload\n"))
-	fmt.Fprint(&b, "\n")
-	k.writeKeyBind(&b, actionCloseFile, "close file")
-	k.writeKeyBind(&b, actionReload, "reload file")
-	k.writeKeyBind(&b, actionWatch, "watch mode")
-	k.writeKeyBind(&b, actionWatchInterval, "set watch interval")
-
-	fmt.Fprint(&b, gchalk.Bold("\n\tKey binding when typing\n"))
-	fmt.Fprint(&b, "\n")
-	k.writeKeyBind(&b, inputCaseSensitive, "case-sensitive toggle")
-	k.writeKeyBind(&b, inputRegexpSearch, "regular expression search toggle")
-	k.writeKeyBind(&b, inputIncSearch, "incremental search toggle")
-	return b.String()
+	s := bufio.NewScanner(bytes.NewBufferString(k.String()))
+	var buf bytes.Buffer
+	for s.Scan() {
+		line := s.Text()
+		if strings.HasPrefix(line, "\t") {
+			line = gchalk.Bold(line)
+		}
+		fmt.Fprintln(&buf, line)
+	}
+	return buf.String()
 }
 
 func (k KeyBind) writeKeyBind(w io.Writer, action string, detail string) {
diff --git a/oviewer/keybind.go b/oviewer/keybind.go
index cb6ce0a8..e0c901aa 100644
--- a/oviewer/keybind.go
+++ b/oviewer/keybind.go
@@ -76,8 +76,8 @@ const (
 	inputRegexpSearch  = "input_regexp_search"
 )
 
-// handlerMap returns a map of the action's handlers.
-func (root *Root) handlerMap() map[string]func() {
+// handlers returns a map of the action's handlers.
+func (root *Root) handlers() map[string]func() {
 	return map[string]func(){
 		actionExit:           root.Quit,
 		actionWriteBA:        root.setWriteBAMode,
@@ -149,7 +149,7 @@ func (root *Root) handlerMap() map[string]func() {
 type KeyBind map[string][]string
 
 // defaultKeyBinds are the default keybindings.
-func defaultKeyBinds() map[string][]string {
+func defaultKeyBinds() KeyBind {
 	return map[string][]string{
 		actionExit:           {"Escape", "q"},
 		actionWriteBA:        {"ctrl+q"},
@@ -217,8 +217,105 @@ func defaultKeyBinds() map[string][]string {
 	}
 }
 
+// String returns keybind as a string for help.
+func (k KeyBind) String() string {
+	var b strings.Builder
+	fmt.Fprint(&b, "\n\tKey binding\n")
+	fmt.Fprint(&b, "\n")
+	k.writeKeyBind(&b, actionExit, "quit")
+	k.writeKeyBind(&b, actionCancel, "cancel")
+	k.writeKeyBind(&b, actionWriteExit, "output screen and quit")
+	k.writeKeyBind(&b, actionWriteBA, "set output screen and quit")
+	k.writeKeyBind(&b, actionSuspend, "suspend")
+	k.writeKeyBind(&b, actionHelp, "display help screen")
+	k.writeKeyBind(&b, actionLogDoc, "display log screen")
+	k.writeKeyBind(&b, actionSync, "screen sync")
+	k.writeKeyBind(&b, actionFollow, "follow mode toggle")
+	k.writeKeyBind(&b, actionFollowAll, "follow all mode toggle")
+	k.writeKeyBind(&b, actionToggleMouse, "enable/disable mouse")
+
+	fmt.Fprint(&b, "\n\tMoving\n")
+	fmt.Fprint(&b, "\n")
+	k.writeKeyBind(&b, actionMoveDown, "forward by one line")
+	k.writeKeyBind(&b, actionMoveUp, "backward by one line")
+	k.writeKeyBind(&b, actionMoveTop, "go to top of document")
+	k.writeKeyBind(&b, actionMoveBottom, "go to end of document")
+	k.writeKeyBind(&b, actionMovePgDn, "forward by page")
+	k.writeKeyBind(&b, actionMovePgUp, "backward by page")
+	k.writeKeyBind(&b, actionMoveHfDn, "forward a half page")
+	k.writeKeyBind(&b, actionMoveHfUp, "backward a half page")
+	k.writeKeyBind(&b, actionMoveLeft, "scroll to left")
+	k.writeKeyBind(&b, actionMoveRight, "scroll to right")
+	k.writeKeyBind(&b, actionMoveHfLeft, "scroll left half screen")
+	k.writeKeyBind(&b, actionMoveHfRight, "scroll right half screen")
+	k.writeKeyBind(&b, actionGoLine, "go to line(input number)")
+
+	fmt.Fprint(&b, "\n\tMove document\n")
+	fmt.Fprint(&b, "\n")
+	k.writeKeyBind(&b, actionNextDoc, "next document")
+	k.writeKeyBind(&b, actionPreviousDoc, "previous document")
+	k.writeKeyBind(&b, actionCloseDoc, "close current document")
+
+	fmt.Fprint(&b, "\n\tMark position\n")
+	fmt.Fprint(&b, "\n")
+	k.writeKeyBind(&b, actionMark, "mark current position")
+	k.writeKeyBind(&b, actionRemoveMark, "remove mark current position")
+	k.writeKeyBind(&b, actionRemoveAllMark, "remove all mark")
+	k.writeKeyBind(&b, actionMoveMark, "move to next marked position")
+	k.writeKeyBind(&b, actionMovePrevMark, "move to previous marked position")
+
+	fmt.Fprint(&b, "\n\tSearch\n")
+	fmt.Fprint(&b, "\n")
+	k.writeKeyBind(&b, actionSearch, "forward search mode")
+	k.writeKeyBind(&b, actionBackSearch, "backward search mode")
+	k.writeKeyBind(&b, actionNextSearch, "repeat forward search")
+	k.writeKeyBind(&b, actionNextBackSearch, "repeat backward search")
+
+	fmt.Fprint(&b, "\n\tChange display\n")
+	fmt.Fprint(&b, "\n")
+	k.writeKeyBind(&b, actionWrap, "wrap/nowrap toggle")
+	k.writeKeyBind(&b, actionColumnMode, "column mode toggle")
+	k.writeKeyBind(&b, actionRainbow, "column rainbow toggle")
+	k.writeKeyBind(&b, actionAlternate, "alternate rows of style toggle")
+	k.writeKeyBind(&b, actionLineNumMode, "line number toggle")
+	k.writeKeyBind(&b, actionPlain, "original decoration toggle")
+
+	fmt.Fprint(&b, "\n\tChange Display with Input\n")
+	fmt.Fprint(&b, "\n")
+	k.writeKeyBind(&b, actionViewMode, "view mode selection")
+	k.writeKeyBind(&b, actionDelimiter, "column delimiter string")
+	k.writeKeyBind(&b, actionHeader, "number of header lines")
+	k.writeKeyBind(&b, actionSkipLines, "number of skip lines")
+	k.writeKeyBind(&b, actionTabWidth, "TAB width")
+	k.writeKeyBind(&b, actionMultiColor, "multi color highlight")
+	k.writeKeyBind(&b, actionJumpTarget, "jump target")
+
+	fmt.Fprint(&b, "\n\tSection\n")
+	fmt.Fprint(&b, "\n")
+	k.writeKeyBind(&b, actionSection, "section delimiter regular expression")
+	k.writeKeyBind(&b, actionSectionStart, "section start position")
+	k.writeKeyBind(&b, actionNextSection, "next section")
+	k.writeKeyBind(&b, actionPrevSection, "previous section")
+	k.writeKeyBind(&b, actionLastSection, "last section")
+	k.writeKeyBind(&b, actionFollowSection, "follow section mode toggle")
+
+	fmt.Fprint(&b, "\n\tClose and reload\n")
+	fmt.Fprint(&b, "\n")
+	k.writeKeyBind(&b, actionCloseFile, "close file")
+	k.writeKeyBind(&b, actionReload, "reload file")
+	k.writeKeyBind(&b, actionWatch, "watch mode")
+	k.writeKeyBind(&b, actionWatchInterval, "set watch interval")
+
+	fmt.Fprint(&b, "\n\tKey binding when typing\n")
+	fmt.Fprint(&b, "\n")
+	k.writeKeyBind(&b, inputCaseSensitive, "case-sensitive toggle")
+	k.writeKeyBind(&b, inputRegexpSearch, "regular expression search toggle")
+	k.writeKeyBind(&b, inputIncSearch, "incremental search toggle")
+	return b.String()
+}
+
 // GetKeyBinds returns the current key mapping.
-func GetKeyBinds(config Config) map[string][]string {
+func GetKeyBinds(config Config) KeyBind {
 	keyBind := make(map[string][]string)
 	if strings.ToLower(config.DefaultKeyBind) != "disable" {
 		keyBind = defaultKeyBinds()
@@ -227,18 +324,18 @@ func GetKeyBinds(config Config) map[string][]string {
 	return keyBind
 }
 
-func updateKeyBind(keyBind map[string][]string, bind map[string][]string) map[string][]string {
+func updateKeyBind(keyBind KeyBind, bind KeyBind) KeyBind {
 	for k, v := range bind {
 		keyBind[k] = v
 	}
 	return keyBind
 }
 
-func (root *Root) setKeyBind(keyBind map[string][]string) error {
+func (root *Root) setKeyBind(keyBind KeyBind) error {
 	c := root.keyConfig
 	in := root.inputKeyConfig
 
-	actionHandlers := root.handlerMap()
+	actionHandlers := root.handlers()
 
 	for name, keys := range keyBind {
 		handler := actionHandlers[name]
diff --git a/oviewer/keybind_test.go b/oviewer/keybind_test.go
new file mode 100644
index 00000000..7deec2a6
--- /dev/null
+++ b/oviewer/keybind_test.go
@@ -0,0 +1,64 @@
+package oviewer
+
+import (
+	"bufio"
+	"bytes"
+	"strings"
+	"testing"
+
+	"github.com/gdamore/tcell/v2"
+)
+
+func Test_defaultKeyBinds(t *testing.T) {
+	tests := []struct {
+		name string
+	}{
+		{
+			name: "KeyBind",
+		},
+	}
+	tcellNewScreen = fakeScreen
+	defer func() {
+		tcellNewScreen = tcell.NewScreen
+	}()
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			root, err := NewRoot(bytes.NewBufferString("test"))
+			if err != nil {
+				t.Fatal("NewRoot failed: ", err)
+			}
+			hm := root.handlers()
+			kb := defaultKeyBinds()
+			if len(hm) != len(kb) {
+				t.Errorf("number of KeyBind = %v, want %v", len(hm), len(kb))
+			}
+		})
+	}
+}
+
+func TestKeyBind_String(t *testing.T) {
+	tests := []struct {
+		name string
+		k    KeyBind
+	}{
+		{
+			name: "KeyBind String",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			kb := defaultKeyBinds()
+			kbStr := kb.String()
+			count := 0
+			s := bufio.NewScanner(bytes.NewBufferString(kbStr))
+			for s.Scan() {
+				if strings.HasPrefix(s.Text(), " ") {
+					count++
+				}
+			}
+			if count != len(kb) {
+				t.Errorf("number of KeyBind String = %v, want %v", count, len(kb))
+			}
+		})
+	}
+}