Right clicking an empty point inside of a room, the room context menu will appear and there will be a command “Visibility”, which allows you to show or hide the contents of the room.
In this manner, it is possible to hide the contents of the room (furnishings, 3D objects, groups, lights, quotes, text…) not only in layout window, but in the navigation and rendering phases of the project, as well; in large multi-room projects, it may be useful to only keep the contents of the room in which you are currently operating visible, therefore speeding up the program's operating times by hiding particularly curated environments that are filled with objects.
This article is valid for the 2019 version and later.