Can you lock the workspace to stay default after viewing another file

I frequently work on files for a few people to make sure they are vinyl cutter ready. The issue I have is they have a different setup for their workspace. Things like line width, colors, fonts etc.

Seems when I open one of their files the next file I work on keeps all their settings and I have to go back and change things.

Is there a way to lock my workspace so it does not default to theirs with my next drawing?

Thanks for any help