Hello Tom HEX_200
Thank you for your response, we are happy to provide further assistance.
In the New Outlook, Editor is where all language related checks and corrections are carried out. It needs to be active/open for it to do its job.
With that being said, we would love to hear your concern as a suggestion in Microsoft Feedback Portal for Outlook. I believe that your suggestion is constructive and it could make the use of Outlook even better. We will surely raise your concerns with our Product Development Team and hopefully, this can be included in future updates. Please note new Outlook is still in active development, right now 65 features are in development and 20 more have started to be rolled out. To check for upcoming features On Microsoft 365 Roadmap | Microsoft 365.
Our Product Development Team is committed to enhancing the customer experience by continually examining suggestions to include in the design and development of future product upgrades based on your suggestions. Hopefully, your suggestion will help many users in the future.
Thank you for your time and understanding. For other questions, feel free to add your post to the Microsoft Community team.
Best regards
Community Moderator