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Hi @katia97 , thank you for using Fullscreen Menu plugin! Hope it’s being useful for your projects!
The submenu hierarchy is pretty possible! You just have to add that hierarchy in the menu and click on the main one to show the sub-items.
We don’t hide the other menus on the website, for GeneratePress you can to to Customize > Layout > Primary Navigation and set the position to “Hide”.
Let me know if this helps!
Sam