The ability to manage approval structures by adding or removing users from mini markets is controlled in the following location in the role:
Click into the Admin Cogs
icon along the top bar and click into Organisation Administration.Click into Roles.
Click the Edit button to access the role and into the Permissions tab.
Navigate to the sub section Mini Markets.
All settings relating to attaching users to mini markets is under the section User Assignment.
After any changes click the Save button at the bottom of the screen.