In a score, some players play several instruments.
The label to change instrument appears immediately after the note played last in the instrument from which the player changes - and so does the key change, when the next instrument has a different transposition.
So that D major in the B flat clarinet turns into E flat major when changing to A clarinet. Along with the instrument change text, there will immediately be a key change - also in the middle of a bar. Sometimes this produces results that don’t look good. But I can not find a way to put the instrument change, or its accompanying key change, where I want.
(To add some confusion: In one of the attached picture examples of the key change I would like to have the opportunity to manipulate, notice the change to E flat clarinet - it is, for inexplicable reason, placed at the next barline, and not immediately after the last note, as in the other staves. I have no idea what I have done in that particular player.)
I am at a loss.
(Later, I will add a particularly problematic example of why I would like to manipulate the placement of the key signature change that may follow an instrument change. A particularly not good looking example. Haven’t got it available right now.)
Thanks for reading and sorry for the clumsy explanation.