I'd be glad to provide insight for you to print checks in QuickBooks Online (QBO).
To start printing a check, ensure that there are items in your print queue and that you've ticked the Printlater in the checks that you've created so it'll add to the print queue. This way, when you click the Preview and Print button, the system will recognize you're ready to print. However, If you still can't see the check you want to print, I suggest that you check the filters in your Print Checks.
In addition, a cache-related issue is likely causing you the inability to print checks. If this is the case, you can perform some troubleshooting steps. You can use a private or incognito window to rule out cache problems in your browser. Here are the shortcut keys:
If you need further assistance managing checks inside QuickBooks, know that the Community space is open 24/7, and we'll be here to help you again. Keep safe.
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