In order to look around or teleport, you'll need to tap or click your screen and drag. This will allow you to see people around you and view empty chairs.
In order to move chairs, just tap or click on an empty chair and you will teleport to that chair. This is a nice way to chat with people at new tables or just get a new perspective on the room.
If there is something on the venue screens you can get a closer view by clicking on the screen, this will then maximise the screen, to remove simply click on the X located on the top right.