adding and moving instruments is not possible in some instances.
- open new musescore file
- click choose intruments
- switch off of common and use (Concert band) to pick an instrumental group
- pick instruments as follows...
a. trumpet
b. trumpet.
c. trumpet
d. french horn
e. french horn.
f. trombone
g bass trombone
h. euphonium
i. Tuba - attempt to move (bass clef) euphonium to get to a score order as I displayed in part 4 and your musescore will crash.
Comments
See #315599: MuseScore 3.6 crashes when rearranging instrument positions and changing Ordering (see description)