I tried creating an App using one of my lists on SharePoint. On one of the fields, I needed to change the data being displayed from Department (default) to Assigned to. I click on the item, go to Advanced Options > click on Unlock Property changes. I changed the value from Department to Assigned to. The widget to lock back Property Changes is gone. I click on X instead to close the dialog box. Now, instead of seeing an eye, I get an X on the field I just changed.
I have deleted, re-did the process many times. I also tried doing over and over the app but still no results.