The Webstudio app on Windows with an English OS incorrectly marks words in other languages as wrong. Community members discuss potential solutions, such as using the spellCheck property or turning off spell-checking in editing mode. One community member created an issue on the Webstudio GitHub repository. The discussion suggests that the issue is specific to the Electron-based desktop app, and not present in regular web browsers.
The Webstudio app on Windows with an English OS assumes all text to be English and marks every word in other languages as wrong. Notion that uses a similar wrapper gives users an option to turn off spell-checking (second screenshot). Could you have a look whether you can also give us this option?
I have macos / en 2 languages in keyboard setting 3 languages here chrome://settings/languages as Preferred languages but I don't have fr and have no issues with french language spellcheck