I can help you resize the screen, @LCronin.
To resolve this, let’s run the Verify and rebuild tools. The Verify Data will identify any data issues within your company file that's causing your pop-up screen to be that very small. Then, the Rebuild tool will self-resolve it.
Check the steps below:
Verify data:
- Go to File, then Utilities and choose Verify Data.
If it will detect an error, proceed and Rebuild your data:
- Go back to the File menu and then Utilities and select Rebuild Data.
- Choose OK if you’ll receive a message to back-up your company file.
- After creating the back-up file, the Rebuild Data utility will run automatically.
- Click OK when you get the message Rebuild has completed.
Check this article for more information: Verify and Rebuild Data in QuickBooks Desktop.
Here's also a guide on how to submit a VAT return to HMRC - MTD for QuickBooks Desktop.
You can leave a comment below if you need further assistance or help with your QuickBooks. Take care and have a wonderful week!