@Pantherina I don't know what you mean by Autoremove, but here are some tips:
Undo the last line by Meta+Shift+F12
Clean everything by Meta+Shift+F11
In the latest version (at least the one that is in KDE's git repo, users can change all those keybindings. Checkout mousemark.kcfg and mousemark_config.ui files in this link: