Any Active OKRs will appear in your Check-in reminders. Active in this case is anything in your Active tab (so anything not in Draft mode or closed):
If you want don't want to see a particular OKR during Check-ins, you can set the (future) OKR as a Draft. That way, they won't appear in your Check-ins until you're ready to update your progress.
* NOTE: Completed Initiatives are excluded from the Check-in. Since a Key Result can change and go back down or continue to go up, achieved Key Results should still appear in Check-in.
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