line=staff? It's possible to delete a rest of voice 2-4 with "del", https://musescore.org/en/handbook/voices.
With ctrl+del it's also possible to remove a rest oft voice 1 by shortening the measure.
If you want to move notes forward in voice 1, select these notes and use cut and paste.
If this doesn't help, best way is to attache the score.
Comments
line=staff? It's possible to delete a rest of voice 2-4 with "del", https://musescore.org/en/handbook/voices.
With ctrl+del it's also possible to remove a rest oft voice 1 by shortening the measure.
If you want to move notes forward in voice 1, select these notes and use cut and paste.
If this doesn't help, best way is to attache the score.