If you click the right mouse button inside the room when you are in layout window, it is possible to hide/show it.
In the context menu you will find, in fact, the following command: Visibility->Show room/Hide room.
If you hide the room, it will not be anymore visible in Navigation window nor in the Rendering processes, together with all items contained in it (furnishings, 3D objects, groups, lights, dimensions and texts, ….), considerably speeding the work on multiple-rooms projects.
This article is valid for DomuS3D® 2017 and later versions