Remove "Delete Customizer Modifications" for assigned panels?

Hello, 

We are trying to set up our customer maintenance screen to look identical to customer inquiry, except for one tab so that a certain department can access just that one tab. To do this, I am creating a custom panel which locks all fields except for the tab which I want them to have access to. 

I am used to seeing "Reset Panel" when right clicking on a screen, which to my understanding removes all the USERS modifications to their assigned panel.  However, I am now seeing a new checkbox "Delete Customizer Modifications" which completely deletes the newly customized panel in the system. Obviously, I don't want users to be able to delete the modifications which would unlock the restricted fields. 

I have removed the following permissions under Tasks -> Custom Office -> Miscellaneous Tasks: Cusomizer selection, Customizer Export WIzard, and Customizer Import Wizard. I thought maybe this would remove the delete modifications option but it is still there. I would greatly appreciate help with this obstacle. 

Thanks!