For the Windows app, I think it is the Electron app that imposes the spell checking. Not Tana itself. It also drove me crazy and I didn't know how to turn it off. (Something the Tana team should be aware of, in terms of onboarding. I recommend switching it off by default).
Anyway, it is under "Options" in the menu of the app.
You don't have permission to do this.
You're going a bit too fast! Take a break and try again in a moment.
Something went wrong! Please reload the page and try again.
For the Windows app, I think it is the Electron app that imposes the spell checking. Not Tana itself. It also drove me crazy and I didn't know how to turn it off. (Something the Tana team should be aware of, in terms of onboarding. I recommend switching it off by default).
Anyway, it is under "Options" in the menu of the app.