Whilst Game Launcher claims that apps will still show on the home screen, for me they didn't show and anything I tried to display them failed. My solution was to uninstall all the games, disable and force stop game launcher, then reinstall the apps! Fortunately only one game was affected in that I lost Data but I had anticipated this!
I tried that but the apps still didn't show. I could only find them by searching. When I disabled the app they still weren't showing. Consequently the only solution was to uninstall all the games as above.