I'm a rookie at MuseScore, and I'm having trouble when the rhythms are different in different parts. The piece I'm trying to enter is for flute and piano. I have a measure that starts with dotted 8th-sixteenth-eighth for the flute. This I can enter. The piano begins with the right hand playing quarter note over two dotted quarter notes. MuseScore doesn't seem to accept this, so I go with quarter plus eight. When I enter this, the flute part is changed.
So (1) how do I enter two notes for the piano that start at the same time but have different lengths, and (2) how do I keep it from changing the flute when I enter notes for the piano. Two manifestations of the same problem: different rhythms in different parts.
I downloaded a new version today, so I'm running version 22.214.171.12488.