[Bug] Fixed hidden axis labels in px.parallel_coordinates (#941)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

vizro-core/changelog.d/20250106_205004_84141230+manuelkonrad_fix_parcoord_margins.md

@@ -0,0 +1,48 @@
+<!--
+A new scriv changelog fragment.
+
+Uncomment the section that is right (remove the HTML comment wrapper).
+-->
+
+<!--
+### Highlights ✨
+
+- A bullet item for the Highlights ✨ category with a link to the relevant PR at the end of your entry, e.g. Enable feature XXX. ([#1](https://github.com/mckinsey/vizro/pull/1))
+
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+### Removed
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+- A bullet item for the Removed category with a link to the relevant PR at the end of your entry, e.g. Enable feature XXX. ([#1](https://github.com/mckinsey/vizro/pull/1))
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+- A bullet item for the Added category with a link to the relevant PR at the end of your entry, e.g. Enable feature XXX. ([#1](https://github.com/mckinsey/vizro/pull/1))
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+### Changed
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+- A bullet item for the Changed category with a link to the relevant PR at the end of your entry, e.g. Enable feature XXX. ([#1](https://github.com/mckinsey/vizro/pull/1))
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+- A bullet item for the Deprecated category with a link to the relevant PR at the end of your entry, e.g. Enable feature XXX. ([#1](https://github.com/mckinsey/vizro/pull/1))
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+-->
+
+### Fixed
+
+- Fix hidden axis and tick labels for Graph components using `px.parallel_coordinates`. ([#941](https://github.com/mckinsey/vizro/pull/941))
+
+
+<!--
+### Security
+
+- A bullet item for the Security category with a link to the relevant PR at the end of your entry, e.g. Enable feature XXX. ([#1](https://github.com/mckinsey/vizro/pull/1))
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+-->

vizro-core/src/vizro/models/_components/graph.py

@@ -140,10 +140,23 @@ def _filter_interaction(
     @staticmethod
     def _optimise_fig_layout_for_dashboard(fig):
         """Post layout updates to visually enhance charts used inside dashboard."""
-        if fig.layout.title.text:
-            if fig.layout.margin.t is None:
-                # Reduce `margin_t` if not explicitly set.
-                fig.update_layout(margin_t=64)
+        # Determine if a title is present
+        has_title = bool(fig.layout.title.text)
+
+        # TODO: Check whether we should increase margins for all chart types in template_dashboard_overrides.py instead
+        if any(isinstance(plotly_obj, go.Parcoords) for plotly_obj in fig.data):
+            # Avoid hidden labels in Parcoords figures by increasing margins compared to dashboard defaults
+            fig.update_layout(
+                margin={
+                    "t": fig.layout.margin.t or (92 if has_title else 40),
+                    "l": fig.layout.margin.l or 36,
+                    "b": fig.layout.margin.b or 24,
+                },
+            )
+
+        if has_title and fig.layout.margin.t is None:
+            # Reduce `margin_t` if not explicitly set.
+            fig.update_layout(margin_t=64)
 
         return fig