The example is this:
A player holds two instruments, Trombone and Djembe.
Earlier, music had been entered first into the Djembe staff, later, into the trombone staff.
Upon closing and reopening the file, Full Score shows the djembe staff changing to the trombone staff, but there seems to be no way to change back to the djembe staff.
Aren’t both staves supposed to appear in Full Score view (Write mode)?