You need to edit that hatch in your project, not in the family. If a hatch is already in the project it will use that, no matter what you do to it in...
Revit Family Organizer 2020 (build #4.8.5.3) has been released. It works with Revit 2020, 2019, 2018 and 2017. A lot of tools (more than one hundred)...