Left Click on floor to place polygon / 3D shape (in creation modes)
3D Model tool: load a .glb / .gltf file or URL
Left Click on shape to select it
Drag in Move mode to reposition on floor
Scroll to zoom in/out
Right Click + Drag to orbit camera
Middle Click + Drag to pan camera
Delete to remove selected shape
Left Stick walk / strafe in the room
Right Stick turn
Reset View button returns to the start position