CURRENT DEFAULT SAVE FOLDER VERY INCONVENIENT
When saving a score or us "Save As" Musescore always chooses folder C:\Users\Me\Documents\MuseScore3\Scores
I don't use this folder and furthermore have many different folders where I put my Scores.
Clicking Save or "Save As" on an open score should always result in offering to save the Score in the folder where the open score resides - that is the folder you are currently working in.
Clicking Save or "Save As" on a new score should offer to save it in the last folder that Musescore saved a file. This makes sense because of work flow inertia - people tend to do a few things in one folder, then a few things in the next folder, etc.