How to deactivate an expense policy

My employer is making some changes to our travel policy that will make some of our expense policies on the system obsolete. I need to make them inactive but I am having trouble doing this.

I have gone into Manage Policies by Expense Category and end dated the relevant ones, but they are still being picked up and still say active.

There doesn't appear to be a active / Inactive button feature either and a lot of the fields are greyed out for editing.

Is there a step that I have missed?

FYI I am using 24a and have a high level of access within the system including