I can help you on how to adjust your company logo in Quickbooks Online, Trevor.
The logo showing up on the invoice's "print preview" will base on the file size that we uploaded on the system. We can choose the size of the logo through the Custom Form Style and make an adjustment.
Then let's open one of your invoice transaction by clicking on the Sales tab. Choose an invoice transaction, click on "Print or Preview" let's check on its changes.
You can also check on this article for more details: Upload, Customize, and Troubleshoot Logo on Sales Forms.
If you have any other concerns, feel free to leave your comment below. I'd be here to help!