Hi there, @Liz Robson.
Let's run the summary report.
This report shows you the summary information for each box on the VAT return. This will help you as you file your return in QuickBooks Online and then complete and submit your return to your VAT agency.
You can find this report by going to Taxes, clicking on the arrow next to Prepare Return, and selecting View Summary. Alternatively, you can also go to Business overview, select Reports, then select All Reports, and Manage Tax.
Here's an article you can read to learn more about your report: VAT Detail Report.
I've also included the following articles below in case you need some ideas about customising a saving a report:
Fill me in if you have further questions. I'm always around if you need any help