Allow user to delete any palette (as long as one is left remaining in a workspace)
OS: Linux Mint 20.1, Arch.: x86_64, MuseScore version (64-bit): 184.108.40.2068021370, revision: 3224f34
It is quite possible that a palette may become surplus to requirements but may be impossible to delete if it was formerly one of the default palettes.
Suggestion: Enable the user to delete any palette in any workspace (even the default ones) as long as one palette is allowed to remain.