It is possible to change the owner of a collaborative basket. This can allow you to hand over the ownership of a basket once your task is finished, or in case a collaborator leaves, for example.
As an administrator, you also have control over all the baskets in your database, by checking the box "Administer baskets for all users".
To make the change, go to the "Basket Settings" tab, then click "Change" next to the owner's name. Look for the name of the user who will be the new cart owner.