A new action in the Users settings table allows you to quickly add users to a team.
Use this to quickly assign individual users to a team, or select multiple users to add to the same team(s) simultaneously in bulk.
Navigate to Settings > Users.
Select the checkboxes for 1 or more users to add to the same team(s).
Select the Add to team button at the top of the table.
Search and select 1 or more Team(s) for the selected users to be added to.
Select Add # users to complete!
