You can create a team by going to your Teams tab in your project settings, then click "+ New team" (1):
The layout of a team is the way every visible aspect of your UI is set, from columns to smart views to widgets.
If you want to apply an existing team's layout to another team, go to its settings page and use the "Copy" feature (3).
To delete a team, go to its settings page, scroll down under the user list and click on "Delete this team".
To delete a team, you will be asked to retype the team's name as a confirmation mechanism.