The Follow feature attaches your Gather character to the person you're following so that you don't have to navigate.
Open the Participants panel and search for the person you wish to follow. Select their name, and on their info card, select Follow. (You can also open this info card by clicking on a person's name in their video preview.)
You can also right click on a person's avatar and select Follow.
To stop following someone, press an arrow key on your keyboard.
Note: At this time, there is not a way to make someone stop following you, unless you block them. Follow also isn't available on mobile yet. We are exploring these features for the future!