Attending a UX research session can be enlightening! However, it's important to let the researcher take the lead on interactions with the participant. Some tips when attending sessions:
If you have time, reach out to the researcher to let them know you'll be attending. Ask them how they prefer to receive questions during the session.
Turn off your video.
Mute yourself.
Make sure to take notes in the appropriate Dovetail project.
If you have questions you'd like the researcher to ask during the session, use their preferred method of communicating them.
When the participant leaves the session, stay on video to share with the researcher what you learned from the session.