"Qt Versions" page shows checkboxes which behave like radio buttons

1. From the "Qt VS Tools" menu, select "Qt Versions".
2. Have at least two Qt versions configured there.
   In the "Default" column, checkboxes are shown.
3. Click one of the checkboxes.
   There will always be exactly one check mark.

This is the behavior of radio buttons, so the dialog should show radio buttons.