When I open the Find or "Find and Replace" dialogues they appear near the top left corner of my screen, regardless of the size or location of the geany's main window. I don't see a way to change that in the settings. This is confusing when you have multiple windows open at the same time in a layout. Also the dialogue can be hidden under overlays (for example youtube video overlay).
I suggest the popup be offset from the top left corner of the geany window, not the top left of the display.