If you have another writing assistant extension installed, we recommend turning it off for Editor to work best.
Other browser extensions
Go to your browser's extension settings and switch off other browser extensions that check your spelling and grammar.
In Edge, go to the three-dot Settings and more menu, and then Extensions.
In Chrome, go to the three-dot Customize and control Google Chrome menu, and then Settings > Extensions.
To use Editor's spelling and grammar checking in Gmail, switch off the spelling and grammar suggestions in Gmail.
In Gmail, go to Settings.
Choose See all settings, and then scroll down and choose Grammar suggestions off and Spelling suggestions off.
Scroll to the bottom of the page and choose Save Changes.