What is theproblems with Quickbooks online desktop app for mac running Tahoe 26.2 when Invoices and estimate show no readable data?

Thanks for joining us here in the Community, lee109.

I want to make sure you're able to use the QuickBooks Online desktop app without issue. 

When the QuickBooks Online desktop app is displaying viewing and performance errors, there are a few troubleshooting steps to try initially: 

Restart: Close the app and restart your computer to clear temporary glitches.
Private Window: Try logging into QuickBooks Online in a private or incognito browser window (or use the desktop app's "Reset App Data" feature).
Check Updates: Ensure both the QBO app and your operating system are fully updated. 

The following article provides additional info about downloading and using the QuickBooks Online desktop app.

Please give this a try and let me know how things look afterward. I'll be here if you have any other questions.