At the moment, the plugin generates its own menu in WP Admin, under which are 2 sub-menus - a dashboard and settings. Both of these exist as menus already.
I appreciate that having your own menu is good marketing but for the sake of good menu hygiene it would be better to get rid of the menu and to have each sub-menu appear under their respective, existing, core menu - Dashboard and Settings.
When initially setting up (at which point no sub-menus exist), you could retain the main menu, which would then disappear once the set-up is complete.