There are two kinds of collaboration session participants, desktop and HMD users. This article covers the instructions for how to do things as an HMD user. For desktop users, see Interacting Within a Collaboration Session for Desktop Users.
Use Teleport to get around in a scene. Click the following links for:
There are two ways to switch between displaying hands and controllers. With both, to return to the other state, repeat the action.
Align the top of the controllers, bringing them together.

NOTE When using the controllers, tooltips appear to show which functions are controlled by which control.
The controllers are mapped in such a way that both left- and right-handed users can use them.
The controller used to open the Tools Menu automatically becomes the non-dominant hand controller. Therefore, if you are left-handed, you want to open the Tools Menu with the controller in your right hand.
Hand poses are used to communicate visually. Click the Hand Poses Only button to enable it. Now you can make a thumbs up, thumbs down, pointing, open hand, or a fist (closed hand) to indicate liking, agreeing, etc. See VR Hand Gestures for more information.
Line up your hand or controller with the content you want to draw attention to and squeeze the trigger to fire your laser pointer.
To return to using the pointer after hand poses, deactivate Hand Poses Only.

Press Calibrate Ground. A green plane appears to represent the new ground plane.

Move the green plane to where the ground place should be.
Pull the trigger to select that spot and reset the ground plane.

If viewpoints are set up for a scene, they are accessible through the Tools Menu.
NOTE When you change the viewpoint, it only affects you.
If variant sets (VSets) are set up for a scene, they are accessible through the Variant Sets option in the Tools Menu.
Use the Tools Menu on your controller to access the Tools Menu home page.

Click Variant Sets to open the Variant Sets panel.
Click a variant set to change something in the scene.

When multiple participants are in the same real-world space, without some type of safety mechanism in place, collisions can occur. In VRED, we added the safety twin to provide a visual cue to keep you safe and help avoid collisions.
When a blue grid mesh appears (the safety twin), that indicated another participant is nearby.

As they move closer, the mesh of the safety twin begins to fade, becoming increasingly transparent.

If the safety twin becomes completely transparent, that participant is dangerously close.

There is no button in VR to leave a session. If you take off your headset, in the Collaboration module, click
to leave the session. Click it again to rejoin the session, then put on your headset. If the scene has been updated, you will be notified.