Help with Dreamer - Photo & Video Parallax WordPress Theme

Does anybody use this theme? I’m trying to fix somethings a friends
website. The menu is not acting properly. The main menu drops down to
the secondary menu, but doesn’t “fly out” for the third level. I hope
this makes sense. Just wondering where to edit the code for it or to
adjust the settings. It also is messed up on the mobile. Found a some
what way around by downloading Mega Menu Plugin, but doesn’t fix
everything. First time here. Thanks guys.