Problem with the Navbar

I already described my problem in the topic TUTORIAL VIDEO - Dropdown menu with mouseover and menu background highlighting

I added the classes as described in the video. Now the mouseover opens the dropdown. But it will also open all submenus and they are all in the same line with the first dropdown menu, so that some entries are hidden by the opened submenus. Do you have some advice what I can do to solve the problem?

As I didn’t find a solution myself, I tried to delete all classes in the project. It removed all styling of the menu, but the mouseover effect is still there even the class manager is empty! It seems that something remains after deleting the classes (is it a failure of blocs?). On my wishlist for blocs is also a function, which can remove all unused classes from the project to clean up after making experiments.

Best regards