How to change an alto sax staff to C-flat major

I’m trying to transcribe a score into Musescore 3.2.3, that was written in E major, for most parts, but Dflat major for Alto and Baritone sax.

The default key for these two instruments for a piece in E major is C# major.

Is there a way to change the key to Dflat, so I can enter the score as written?

I tried ctrl-dragging each key signature to the staff, but I can’t get the 5-flat key signature on those instruments so I can input the music as written.