Thanks for posting in QuickBooks Community.
QuickBooks Online creates a separate tax payable account for each agency. In order to determine which sales tax transactions are going to the sales tax payable, I suggest running the report for the account through the Chart of Accounts. Let me help walk you through on how.
1. Go to the Accounting menu.
2. Select Chart of Accounts.
3. Click the arrow beside View Register.
4. Click Run Report.
For more guidance on how to manage sales tax, please read this article: Sales Tax in QuickBooks Online
For future reference incase you want to learn more about sales tax liability report, please read this article.
Reach out to me directly if you have any questions and concerns. Please know that I'm here to lend a helping hand. Wishing you the best.