You should not delete or deactivate users from your property if they have access to other properties. This will remove their access to all other properties in PMI.

To remove a user’s access to your property, you should remove the property from their profile. 

If a user has access to just your property and you want to remove his access, then it is safe to delete or de-activate.

How to remove user access to your property only:

1. Click on the pencil (Edit user tool) for the user in question.
2. Open the user roles by clicking on Show more in the User roles row.
3. Find the property that you want to remove access to, and click on the trash can.
4. Follow the steps to remove the property.