Change Submenu Layout in Stitch

Hi all!

The theme I’m using is Stitch because it’s the only responsive template that has a vertical menu.

My issue now is that I can’t get the submenus to show up UNDER the main menu headings. It shows up off to the right of the main menu.

I don’t know if it’s too much trouble to try and change the code or if there’s a theme that does vertical menus easily.

I’m pretty frustrated with it and I’m an absolute zero to novice on coding.

Can anyone help or give me a template solution? It’s for an artist so it will be gallery heavy, but I need the vertical menu. They require it.

Thank you!