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).
The Menu allows you to showcase different areas of your venue and display this on a menu on your tour with direct links to those specific areas.
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.
Overlay Editor provides a function for easily combining multiple tours together into one overlay project. In particular, this function will cover the use case of when you have multiple virtual tours under the same business that you wish to merge together.
With the Gothru Overlay Editor, you can add a Street View image done by Google or a tour published to Google by another photographer to the overlay menu on the hosted tour.