For me, this problem was related to remnants of Cookie 5. Once I got rid of those, everything worked as promised.
FYI, this is what I had to do:

Drag Cookie 6 to AppCleaner. Reinstall Cookie 5, then drag Cookie 5 to AppCleaner Delete anything related to Cookie 5 that didn’t get uninstalled in Containers folder and Applications Scripts folder Empty the trash Reinstall Cookie 6 AVOID option to import Cookie 5 settings Allow Global File Access
Then the Enable Safari browser function worked and I’m able to get to the cookie window.