Orbital main menu does not work

Hello all. I am a user of the orbital theme and I am not able to fix the main menu. When I create categories or add the search button, these are the results:

https://drive.google.com/file/d/1qI7Hx1U2BvJHX_j-AJVWJBMY3WKQi-Jy/view?usp=share_link

https://drive.google.com/file/d/1u15S_cbGEDm7bXsY0dvXu2xrgA4uO-To/view?usp=share_link

I don’t understand why I can’t have a conventional menu… is it a CSS issue?

Thank you very much in advance

The page I need help with: [log in to see the link]