The Organizer is simply a database that displays photos stored on your computer hard drives. If you import photos into the catalog and then change the location of the files using Windows File Explorer or Mac's Finder, OR if you disconnect an external drive (or memory card) where the files are stored, the Organizer will not know what happened to them and will treat them as missing. This is why you have the question mark icon displayed instead of the full photo thumbnail.
You can delete the missing thumbnails from your catalog by selecting them and pressing the Delete key on your keyboard. A message will then pop up asking if you also want to delete the files from your hard drive. I suggest you don't accept that option until we figure out what you are doing wrong.
As for the menus being non-responsive, that usually happens on a Windows machine when you have your computer set to auto-hide the task bar. If that is the case, hover over the task bar and right-click on it. You should then choose Taskbar Settings from the pop-up context menu. That will take you to the Windows settings where you can disable the Automatically Hide setting under Taskbar Behaviors (in Windows 11).
