Options are:

a) Show just filename like 2.1 and before. Problem with this is that you don't know which project the file belongs to. Especially annoying if you use same subpresentations in multiple projects.

b) Show only the end of the file path with ellipsis on the front. How many characters should be shown?

c) Show beginning and the end of the file path with ellipsis in the middle. How many characters should be shown?

d) Don't change, the current way is good. It is how Qt Creator's recent files menus work, after all.