Hi Martin Phinney,
Thank you for your reply.
We fullly understand now you found there is no such option in new Outlook. Based on my testing and research, the result is the same, seems now it's not achievable with new Outlook. Please kindly note the New Outlook is still in preview, hence there some features that existed in classic Outlook has not be provisioned or update. it's never our intention to disrupt/reduce its functionality. In this siutation, we suggest you to revert to classic Outlook if you really need the feature.
The option to switch back to classic Outlook remains available via Help > Go to Classic Outlook, and we encourage users to choose the version that best suits their needs.
If you feel that the preview of the new Outlook is too early, we apologize. The new Outlook team is working hard to update and fix many of the issues that are currently occurring. If you want to share the issues that affect you or the features you need, our engineers will value your input through the "Feedback" button.
Your patience as we refine this product means the world to us. Please know that your voice directly shapes new Outlook's evolution.
For the future update process of the new Outlook, you can refer to: Microsoft 365 Roadmap | Microsoft 365.
Thank you for your time and understanding.
Kind Regards,