This page allows to view and manage team members and their roles. Creating a team within the Vast.ai platform involves a unique process where your current user account is transformed into a team account. More on that here.
Here's an example of what a team page would look like in the console.
In it you can click on the "Add Role" button which will produce this pop-up.
You can also click on the "Remove Role" button which will produce this pop-up.
As you can see from the images, this Teams console page easily allows you to view and manage the current state of your team.
You can read more on that process here.