New Score Wizard: No OK/Close Buttons in Sub Dialog Boxes

Issue type

Accessibility issue (e.g. for keyboard-only or screen reader users)

Description with steps to reproduce

In the New Score Wizard, buttons are used to open sub-dialogs for selecting the key signature, time signature, tempo and number of bars.
None of these dialogs has an OK/Close button. This leads to possible confusion: pressing Escape should ideally Cancel, not OK changes.

Steps:

1. From the File menu select New or press Ctrl+N.
   The New Score wizard appears.
2. Select instruments or choose a template in the first page.
3. Press the Next button to move to the second page of the wizard.
4. Press any of Key signature, Time signature, Tempo or Number of Bars buttons to open a sub-dialog.
5. Tab around and notice there is no OK/Close button to return to the previous dialog.

Expected behaviour: all dialogs should have a tabbable button that confirms or cancels the options in the dialog. Sometimes this will be a pair of OK and Cancel buttons, other times it can be a Close button.

Actual behaviour: there is no such button.
Workaround is press Escape (normally a Cancel action), but is unclear that doing so actually accepts the choices and closes the dialog.

Supporting files, videos and screenshots

N/A

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

4.5.2

Regression

I was unable to check

Operating system

Windows 11 with NVDA

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