The People tab is where, as an owner, you can manage the organization members' privileges:
From the preceding image, you can see that, as an owner, you have a higher overview of the members in your organization. Let's examine what all of these settings mean.
The red triangle simply means that a member has not enabled Two-factor Authentication. From a security perspective, you would want every member of the organization to have enabled 2FA to prevent a potential account compromise that would lead to gaining access to the organization's repositories.
Then, you can see in how many teams each member is part of. Clicking on the number will ...