Hi there, @BernieJ.
Currently, the keyboard shortcuts to switch between tabs in QuickBooks Desktop (QBDT) is not available. As a way around, you'll want to hover your mouse to open each tab.
Rest assured I'll take note of this as a feature request and pass it along to our product engineers. They are always looking for ways to improve our products that suit the needs of our customers.
To learn what our product team is up to, you can check our Product Updates page for reference. I'd also encourage checking our Help articles page. From there, you can read great articles that can guide you in your future task.
In case you need further help, you can always contact us anytime. I'd be glad to work with you.