The visit is in passive mode.
For each device, the navigation mode is different:
Computer
Hold down the left mouse button to move the view.
Click on the icons in the scene to move or discover more information.
Mobile
Rotate the phone or tablet to move the view.
Tap on the icons in the scene to move.
Cardboard
Using a compatible phone, the "Cardboard" icon will appear.
Then inserting the phone into the aforementioned holder will make immersive mode available.