What causes the Change workspace/model to disappear in the Manage model screens of the App?


When I open the app contents screen and select Manage this app button, I click on the Manage models button. In some of the Page rows I can see the drop down for Change worksheet and Change model but not all.

I am a WSA and a PB.

Both of the Pages belong to the same Workspace and Model.

What causes some to display the option and some not to?