Crash Restore last session - Corrupted MuseScore.ini
When you move the user interface window to an associated monitor, other than the main display, and close Musescore from that screen, then the MuseScore3.ini file is automatically modified, and the new settings saved. prevent MuseScore from reopening.
By taking care to make a backup beforehand of the .ini file, then by replacing the newly modified file with the backup, everything is in order.
If we take a closer look at the structure of the.ini file using a text editor, Notepad for example, we see that two items have been modified after closing the session from the remote screen: Geometries and MainWindow
MuseSore OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 184.108.40.2068021803, revision: 3224f34
Windows 21H1 (build 19043.1202)