I'm new to fusion 360 and so my suggestions/problems are not related to new vs old UI. Just New UI.
First, the undo command doesn't seem to work consistently. It seems pretty hit and miss if the thing I'm undoing is actually the last thing that I did.
Second, the undo command in most software in the world is ctrl-Z which seems really important if you don't want to use your mouse to click the non-intuitive curly arrow. ctrl-y or ctrl-r is usually redo.
Third "Solid", "Metal", "Sheet Metal", "Tools" are tabs. They don't look like tabs. They look like a line of text. Can you stick some lines around them, so a beginner like me knows they do separate things?
I like that the menu has the key equivlent showing. Would it be possible to have the menu always showing (a flyout menu)?
The print 3d is a very nice touch. I got it working with the prusaslicer with much difficulty. I ended up making a custom executable that called it because I wasn't able to call it directly. (although maybe I just wasn't understanding your system). Perhaps this could be improved on. Ie, program to call, and location to be executed.
All in all the program looks very powerful, and like all powerful programs very frustrating to learn. Hopefully, these ideas might make it easier for the next person.
