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Welcome aboard to the Community. I'd be glad to help you out with locating the voided checks in QuickBooks Online.
You can view the Transaction List section of the vendor profile to show the voided checks. Here are the steps:
I'm adding a screenshot below for your visual reference:
You can also run the Transaction List by Vendor report to show what you need with the vendor checks. I'm adding steps below for your reference:
I'm adding a screenshot for your visual reference:
In case you need additional insights, I'm also adding a support article for running the vendor report:
Run a report for all vendor payments.
The Community has your back, so feel free to let me know if you have any additional questions with the voided vendor checks. Wishing you all the best.