It seems as though scaling of the "Save Changes" dialog is a tad funky. I tested it on both a 4K and an HD (1920) screen as well as with and without scaling. Results are the same in each situation.
The dialog question, "This project has been modified. Do you want to save changes before closing?" has a scroll bar and the last bit of text is obscured.
I have attached a screen shot of both the 4K and the HD screens.