How to change the align of the floating MENU ?

Hi,

My problem is: the florating MENU is now on the left and I wanna have it on the right
– its passible ?

Definitely possible.

Try adding this CSS:

nav#sticky-navigation .inside-navigation {
    justify-content: flex-end;
}

Here's how to add CSS - https://docs.generatepress.com/article/adding-css/

You can also consider using the navigation as header option without the CSS Elvin provided:
https://docs.generatepress.com/article/navigation-as-a-header/

Thx!

Robert

No problem :)