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Leave a shared reminder list on iCloud.com
To stop participating in a shared reminder list, you can leave the list.
Note: If you’re using updated reminders, you might not see all of your shared lists on iCloud.com. You also can’t manage sharing on the web. Use the Reminders app on a device with iOS 13, iPadOS 13, macOS 10.15, or later to see and manage all your shared lists.
Go to icloud.com/reminders, then sign in to your Apple Account (if necessary).
Click
next to the shared reminder list you want to leave.
Click Leave List, then click Leave List again.
To rejoin the shared list, ask the owner to reinvite you.