Switch to GPT, makes Things easier. You can do that from inside Windows without Reinstall or anything. Also Install Linux in another Drive, then you got No issues.

What about Windows Store 😏

Yeah, even after owning a Steam Deck for a year and recently switching my Desktop to Linux, its very hard to get the settings right. Things Like uplay working in Steam Deck but Not out of the Box in my Desktop seems so insensical to me.