When you enable the Team support feature, you can manage teams from the Teams tab under the User management section of API Gateway.

If you do not enable this feature, you can still create teams, as explained in Creating Teams, and assign functional privileges to users. However, you cannot assign required assets to a set of users and restrict the access of assets to other users.

If you have enabled this feature, created teams, and assigned assets to teams, and then disable this feature, then the team assignments that you had performed earlier become invalid. That is, the assets are available to users based on their functional privileges and not based on the assigned teams.