Handle appears in upper left corner of page when fretboad diagram legend is selected

[avvvvve]

Issue type

UI bug (incorrect info or interface appearance)

Description with steps to reproduce

1. Add some fretboard diagrams
2. Add a fretboard diagram legend, select it
3. See handle in the upper left corner of page

There should be no handle on the fretboard diagram legend frame.

Supporting files, videos and screenshots

handle-fdl.mov

What is the latest version of MuseScore Studio where this issue is present?

Nightly

Regression

No.

Operating system

macOS 15

Additional context

No response

Checklist

• This report follows the guidelines for reporting bugs and issues
• I have verified that this issue has not been logged before, by searching the issue tracker for similar issues
• I have attached all requested files and information to this report
• I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible