Thanks for reaching out to the Community, @tlegleu.
In QuickBooks Online (QBO), you can run the Transaction Detail by Account to see the transfer in both accounts.
Here's how:
- Click Reports on the left pane.
- In the search box, type Transaction Detail by Account.
- Set the Report period.
- Pick the Customize button in the upper-right.
- Scroll-down a bit and click Filter.
- Check the box for Account, then click the drop-down list beside it and select the two bank accounts.
- Hit Run report.
To know more about customizing reports, you can check this article: Customize reports in QuickBooks Online.
If you have other concerns, let me know. I'll be more than willing to help. Have a great day!