The ovito 3.15.x Add modification menu layout is not reasonably designed. When the GUI main interface is positioned slightly below the center of the computer screen, although the menu interface can display more sub-options upward, the top portion of the screen gets cut off
Iād also like to thank you for reporting this issue. I was able to reproduce it and have fixed it in the OVITO code. It should no longer occur in the upcoming release 3.15.5.