Separate versions of the same ERD in one project

Hi. I need to create 3 versions of an ERD in the same project, so I created 3 new ER diagrams. The names off the entities and their relationships are the same in each, but they are all to show different levels of detail, as follows:

  1. Entities & relationships only
  2. Entities, relationships and keys (primary, foreign)
  3. All of the above with attributes

My problem is if I modify one diagram, it updates the others. How do I stop this?
When I create the new columns I click on “NO” when the message pops up saying “Show new member in other views”, but foreign keys still show in the other ER diagrams. Basically, is there a way to create separate diagrams which don’t affect each other, in the same project?

Thanks in advance