Steps to reproduce:

• When the user is on Edit view, seeing a content item that includes Multiple Object Relations field type with several items selected,
• And she wants to add more content items to her current Multiple Object Relations list,
• And she clicks on the Plus button in the table, then UDW is triggered,
• And when the user goes to through the content tree, she cannot see which are the content items that have been selected with the checkmark label.

(Attached explanatory gif)

User should see the Checkmark label and also should be able to uncheck these previously selected object relations within the UDW too.