Key signature issue

I have a saxophone workbook I'd like to work from in Musescore. When the piano key is E major (4 sharps), and the books has the Eb Alto Saxophone part in C# major (7 sharps), but Musescore always turns this into the key of Db major (5 flats).

This makes working from the book much more difficult for a beginner to transcribe.

Is there some way the high black note keys can be overridden by their alternatives?