Inheritance vs. Dropdown Menus

Would inheritance cause drop-down menus in the Antimatter theme to stop working? ... I cannot get nested menus to work.

I have followed the instructions for Inheritance and it works great, and I've enabled submenus in my ChildTheme YAML file and in Antimatter.

Suggestions?

Go to [Themes] click your active Animatter theme. Scroll down and check if [Dropdown in navbar] is enabled. Grav-min