I've just got the steps you'll need to see what invoices and sales receipts contributed to the totals, RedTopConstruction. 

It's pretty easy and really quick. From within the Sales Tax Liability page, double-click on the amount, an example is Non-Taxable Sales . From there, you can see all the invoices that contributed to the total amount.

I've added screenshots for your visual reference:

If you'll encounter some issues while working on your sales tax, please read this article that contains information on how to troubleshoot unexpected results: How to resolve common sales tax issues.

I've got your back if you have any other questions managing your sales tax in QBDT. Have a good one!