Visibilities Menu
You can access the Visibilities menu on the top right of the screen just next to the Room list icon/button.
To enable that first press the spacebar to open the pause menu.
Once you left-click on it with your mouse/touchpad the new window will open with visibilities functions where you can toggle of:
Facade
Windows
Staircase
Furniture
Doors
If you are in floor-plan view then you will have additional few options in the visibilities menu that you can toggle on/off.
Electric installation
Room labels
Room dimensions
If you are in the first-person view then you will have only few options in the visibilities menu that you can toggle on/off.
Windows
Doors
Furniture
On the top of the window, you will find an X button that will close the Visibilities window and a Minimize button which will minimize the Visibilities window on the top of the pause menu.