On the web user interface, you can have an overview of all the groups you are currently in on the left-hand side navigation when you click on "Bases".
Perhaps you'd like to re-order these groups. Besides moving them manually with your mouse on the interface, you can also use this API request to do the same job.
Here's how it works: In the request form, give the group_id of the group you'd like to move and tell the system where to move it to: under which group ( anchor_group_id ). If you are just moving it to the bottom of the list, let to_last be true .