Hi, @wheatonmeat.

Thanks for joining this conversation. I'm here to help address the issue you're having with customer statements in QuickBooks Online (QBO).

Are you trying to print your customer statements? If so, you can manually change the paper size to your preferred envelope size in the Print or Preview section.

Here's how to do it:

1. Open the customer's statement.
2. Click the Print or Preview option at the top bottom.
3. Tick the Print icon at the upper right.
4. In the More settings section, choose your preferred envelope size in the Paper size in the drop-down.
5. Hit Print to complete.

For more information about managing customer statements in QBO, please visit this article: Create and send customer statements in QuickBooks Online.

If the issue persists, this may be a PDF printing issue. In case this, I suggest checking out this article for steps on how to fix it: Test sequence for PDF printing issues.

I'm only a post away if you have any other issues or concerns. I'll be around to help. Take care and have a good one!