to pan the view, use the WASD or arrow keys on your keyboard.
to select a different object click on one of the entries in the menu.
to stop or start the rotation, click on the "rotate" entry in the menu.
to switch to full screeen mode, click the "VR" icon at the lower right. When you are browsing this page using a VR headset like Google Cardboard/Daydream, SamsungGear VR, HTC Vive, Oculus Quest, Rift, etc., this icon takes you to the virtual reality view where you can walk around the structures!