Hello there, @bwoehle.
Thanks for reaching out to us. I'm here to help on how to remove a check in your QuickBooks Online.
In this case, what you need to do is delete the check you've sent for your client. To do this, here's how:
- From the left menu, select Sales.
- Choose All Sales.
- Find the check transaction.
- Select More, then choose Void or Delete.
- Click Yes to confirm voiding or deleting transactions.
For additional reference, you can check this article: How to void or delete an invoice or other transactions.
This will get you on the right track! Don't hesitate to leave a comment below if you have any other questions about check. I'm always here to help. Have a good one.