Geany has a few inconsistencies in the menus:
* On macOS, Undo is Cmd+Shift+Z, not Cmd+Y. * Preferences is usually under the Geany menu and has the shortcut Cmd+Comma (but it is usually automatic). There is a way to set the menu item to function as the Preferences menu, but I don't know it off hand. * Mac has a built-in fullscreen mode which seems to function like Geany's, so the menu option can be disabled. * The F1-F12 keys are a pain to use, as they are, by default, mapped to stuff like changing the brightness. * Zoom In reacts to both Cmd+ and Cmd=. Right now, it seems to react to neither.
That's all for now.