Matrix Visual

The issue you're encountering with Matrix Visual row headers bold formatting—where only the last inserted row responds correctly to the bold toggle and earlier rows do not—is a known behavior in Power BI.

Causes and Workarounds

• This is often due to how Power BI manages Row Subtotals and their formatting, which affects row headers globally.​

• The parent level row headers are intentionally always bold as part of the current design from the May 2024 update onwards.​

• You can try this workaround that has resolved similar issues:

  1. Enable Row Subtotals in the matrix visual format pane.

  2. In the Row Subtotals settings, locate the Values section and turn off the bold formatting.

  3. Turn on Apply to labels under these settings.

  4. Optionally, toggle off Row Subtotals after applying the formatting to keep your desired visual structure.

• This forces the bold setting to apply uniformly across all row headers, not just the last one.​

• Note that subtotal rows themselves remain bold, and complete removal of bold on all row headers may not be supported due to design behavior.​

Summary

• The behavior is partially by design after recent updates.

• Using row subtotal formatting with "Apply to labels" is the best workaround.

• Full control over bold row header formatting may require waiting for future Power BI updates or using custom visuals.

This approach should help you achieve consistent bold styling on all row headers in the Matrix Visual instead of just the last row.