The current wp_smart_navwalker does a great job of making top-level menu items but doesn’t do anything to let you create or style sub-menus. The only way I’ve seen to make dropdown submenus (even common single-level ones) easily is to use the Bootstrap framework, and the custom walker Pinegrow built for it. Those of us using Tailwind or no framework are left out in the cold.
The current system also copies the same classes from the ul > li elements to ul > li > ul > li. I know that I like to have different hover styles for submenus, so this is especially problematic.
In my opinion, this is one of the biggest shortcomings of Pinegrow’s theme creation features. I’ve had to rely on 3rd party plugins like Max Mega Menu to make my menus, and I’d love to remove that dependency.
As a side note: The Help button in the Nav Menu action goes to the old documentation site, which is no longer available. Here is a link to the text of the old article that I saved from the wayback machine.