I have an arrangement which is played in swing through the whole song. Now, I want to remove swing for a short section, but only for one staff. Is that possible? It's meant for the playback.
Quick answer: Yes in Sibelius, Dorico and Finale (current versions) but No for MuseScore. In MuseScore 'Swing' and 'Straight' affect all the staves.
I don't think there's even any way to cheat it in MuseScore by micro-editing individual notes. Individual velocity, and even tuning, can be edited, but not playback position. Sorry.
It is very unusual to notate swung notes on the staff. Typically, the notation I see as Todd notes is the beginning of the tune is notated "Swing Feel" and then text notation for "Straight 8ths" for the straight part.