‘shortcode deactivated’ when creating menu

Trying to create my first menu with this plugin but the newly created menu displays “shortcode deactivated” in the responsive-menu dashboard area. I’ve tried uninstalling, then deleting, then downloading and reinstalling a new copy of the plugin. I’ve tried deactivating all my other plugins to see if there’s a conflict. Nothing has helped. (I’m using wordpress twenty-twenty-five theme.)

I really like what I’ve seen of this menu as I created it and hope there’s some way to actually get the shortcode I need to use it!