Removing an Owner from a Workitem
This article explains how to remove an owner from a workitem.
Overview
You can use the Member Planning page to remove workitems from a member's backlog and moves it back to the No Owners grid with a status of "Unassigned".
Steps
- Click the hamburger menu 
> Sprint > Member Planning.
 - In the Members grid, click on the + symbol next to the member's name to see the list of workitems assigned to them.
 - Locate the workitem you want to unassign, and then double-click on a row to make it editable.
 - Place your cursor in the Owners field, and then click on the x next to each team member's name.
 - Click Save.