Don't use Chrome's and Edge's Enhanced Spellcheck features
Google Chrome and Microsoft Edge include options to improve the basic spellchecking functionality of the web browser.
Chrome's Enhanced Spellcheck and Microsoft Edge's Microsoft Editor are designed to improve spellchecking further, but they do by transferring pretty much anything that users type into fields to company servers.
Chrome users find the Enhanced Spellcheck feature on the Languages settings page. It can be accessed by loading chrome://settings/languages in the browser's address bar, or by selecting Menu > Settings > Languages.
Once enabled, Chrome uses the same spell checker that Google Search uses. Google notes that text that users type after enabling the feature is sent to Google.
Similarly, when users enable Microsoft Editor in the Edge browser, they improve spell checking but have their typed data submitted to Microsoft as a consequence. Microsoft does not mention that typed data is sent to company servers when Microsoft Editor is enabled.
Josh Summitt published his findings on the functionality of the enhanced spell checkers on the otto-js company blog.
https://www.ghacks.net/2022/09/19/dont-use-chromes-and-edges-enhanced-spellcheck-features/
https://www.otto-js.com/news/article/chrome-and-edge-enhanced-spellcheck-features-expose-pii-even-your-passwords