These things are synchronised:
- The list’s name
- The list’s colour
- New items
- Renamed or updated items
- Deleted items
- Items marked-off (crossed-off) the list
If items have been marked-off the list, use the Clean-up action to remove them. Items removed in this way are not synchronised with other list participants.
Each of your lists has its own sharing settings, which means you can create private lists, or choose to share each list with a different set of people.