Creating Workspaces - I'm confused about the logic

When creating a NEW workspace, does Musescore create it from the current state of the DEFAULT workspace (i.e. you have changed some things in the DEFAULT workspace alread)?

Or does it create the New workspace based on an absolute Default workspace, a ground zero workspace if you will, one which Musescore has stored some where in its bowels?

I'm having a hard time understanding how to push the changes I've made so far to the DEFAULT workspace into the NEW workspace.

Marc, I'm going through your customization video for MS4 right now and it may be in that. But I'm posting this in case I can't find it.

Thanks,
M.