Source: https://www.peeayecreative.com/how-to-open-a-divi-menu-submenu-by-clicking-instead-of-just-hovering/
Needs jQuery and CSS
Works but has issues
- Mobile not sure, there are comments that it doesn’t work. Didn’t test
- Submenu remains visible after you click other main menu items
- Main menu can’t have a link anymore (can but doesn’t work)