To change the starting day number, go to your schedule page and then click on the pencil icon to the left of the starting day circle.

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This will open a pop-up that will allow you to set the starting day number to your desired number. That looks like this:

Once you save this, you should see the day counts adjust accordingly. You may need to do a page refresh in order to see the updated day number on your call sheet previews.

Please note that currently you can only adjust the starting number for the schedule and cannot change the day numbers on specific days individually.
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