Heelo,
I think it would be very pleasant to go back to a former drawing once you have looked to another drawing.
For instance, I look at a drawing , 12345, and then I want to look at drawing 23456 for a while. Now I want to go back to drawing 12345. I have to go to all the sub directories and find 12345 again.
Why not a go back button?
Even to go back twice or three times.
Other programs has such a button.
Regards Jan Br.