E.g. You have a daily checklist you use when starting your day called "Daily chores". Every morning you wish to remove all the check of the previous day. Go to the Dashboard and click on the check of the "Daily chores" checklist. If the list was not completed, you might need to check again to clear. Click on the checklist itself to go into it and verify it has been cleared. Note: if all check are still marked, simply go back to the dashboard and click again.After doing this a couple of times you will get the hang of it.