I am having great trouble using the resize feature of Inline Notes on a touchsreen, both with fingers and a styles.  The eight squares are there. I did a little bit more of trial and error on my two machines, and I think I figured out what the problem is. They are just too small two hit with a finger, and even with a stylus it is very difficult to hit them--I vaguely remember having that issue with my mouse, too, when I first started using Okular. So the solution might be to make the clickable area a few pixels bigger than the squares. Even when I am very intentional, I can only hit the squares about 50% of the time on a touchscreen.