How can I remove the unused packet marks?
I’ve done some test in order to figure out some things and now I want to get rid off those unused entries.
You mean from the drop down menus? Remove all references to the packet marks. You may have to reboot to clear out caches entries.
yes, if some rule uses this mark, it will show up in the dropdowns. if you remove that rule, the mark will also not be offered anymore.