Hello:
Not sure if you are referring to the Wix Editor or Studio, but in the Wix Editor, there is a way to align the submenu as part of customizing the design. Right now, the only options are to the left or to the right. I have actually had a lot of trouble recently getting the submenus to align properly, even just to the left or right.
If this is part of creating a hamburger menu using a lightbox, there is a better option. We can now add hamburger menus directly. I have had better luck using the dedicated hamburger menus.
Here’s how: Wix Editor: Adding and Setting Up a Hamburger Menu | Help Center | Wix.com
I hope this helps.
Dena