Key signature from more sharps to fewer sharps (visual problem)

Hey there! I am in C# major scale with 7 sharps. After a couple of measures, i want to transpose to C# minor that has 4 sharps. What i DO NOT want to have regarding the visual part of the sheet, is from a key signature with 7 sharps to appear a key signature of 4 sharps just straight ahead. What i DO want to be seen in the sheet is, in the first measure (or system) of the transporto, 4 sharps and 3 naturals, and THEN in the follow measures (or systems) just 4 sharps. Is this possible in musescore 3?
Thank you in advance.