seekbar not showing in Relative Layout

[talhacomak]

in Android 11 tablet, compile sdk = 30, target sdk = 27;
I placed the layout below in a Relative Relayout. I also used many combinations like translationZ, bringToFront etc. Nothing worked. The seekbar certainly not showing.

`<com.h6ah4i.android.widget.verticalseekbar.VerticalSeekBarWrapper
android:id="@id/seekbar_wrapper"
android:layout_below="@+id/setting_value"
android:layout_width="wrap_content"
android:layout_height="200dp">

        <com.h6ah4i.android.widget.verticalseekbar.VerticalSeekBar
            android:id="@+id/camera_seekbar"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:max="100"
            android:maxWidth="15dp"
            android:minWidth="10dp"
            android:progress="30"
            android:progressTint="@color/blue"
            android:splitTrack="false"
            android:thumb="@drawable/thumb_image"
            android:thumbOffset="0dp"
            android:thumbTint="@color/blue"
            app:seekBarRotation="CW90" />

    </com.h6ah4i.android.widget.verticalseekbar.VerticalSeekBarWrapper>`

[SpannerBear]

Can not show seekbar too.