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To get rid of this reminder, you’ll want to put a checkmark in the box from a prompt that says “Do not show this message again”.
You can assign one check number to reset. This will auto-filled the check number in the next number in sequence from the previous check you just recorded. Here's how:
You can refer to this article in case you want to edit the checks in QuickBooks Desktop: How to edit check or paycheck numbers.
I also added an article about printing checks for your future reference: Create, modify, and print checks.
Come back to me if you need more help. I’ll be here anytime.