"Disable logic" setting
Musescore is programmed in a way that tries to guarantee the user can't make any errors, such as using two notes on the same string at the same time.
This is similar to what most chess programs do when they don't allow the user to input an illegal move (such as a rook moving as if it were a bishop). Nevertheless, the leading chess software has a box the user can tick to disable rule enforcement. Although not used very often, this allows players to register mistakes they committed during a game without either player noticing. Without that feature, a game transcription could be impossible to continue from the place the mistake occurred and forward.
Back to music, the use case for such a feature in MuseScore would be allowing the user to circumvent the rules and fix it later in order to facilitate the editing process. This is happening to me right now: due to my lack of knowledge, I didn't know it was better to start notating the basses in voice 2 before continuing with the trebles. Now when both voices share the same note, MuseScore automatically assigns the new one to another string. This means I'm having to first select the shared notes on the treble part, swap them to voice 2 and then rewrite voice 1. This kind of process could be easier if I could stop rule enforcing just for a little while.