In Gothru Overlay editor you are able to create a multilevel menu via Overlay Menu Settings (Plugin Manager > Menu > Side/Top Menu) as well as via the Active Plugin (Active Plugins > Side/Top Menu).
Berlin uses a transparent black background and green active color. This menu can also include various items to the menu list such as adding active pano and links that connect to a webpage.
Top Menu is one of three available menus in the GoThru overlay editor. With the Top Menu, you can showcase different areas of your venue and display this on a menu at the top side of your virtual tour.