Yes, you can create a menu separator by clicking the toolbar button that’s next to the “new menu” button. It’s the 5th button from the left and it has a green “+” symbol.
I was also trying to move the “bbPress Notify (NoSpam)” inside another menu but could not work out how to do it.
If you’re using the free version, you can do it by cutting the menu and pasting it in another menu. Use the “cut” and “paste” toolbar buttons.
Please note that it’s not possible to create menus with multiple nesting levels in this way. WordPress currently only supports two admin menu levels: top level menus and submenu items (A -> B). More complex structures like A -> B -> C are not supported in the admin menu.
