I reached out to support, and their response boiled down to
- This feature is currently not available but is being worked on (no ETA for completion)
- If you want this feature toggle off New Outlook in the top right
Hopefully, they will add this and other features to New Outlook soon as I really enjoy the UI improvements over the traditional Outlook appearance.
See below for the Microsoft Support Agent's full response
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08/09/2023After analyzing on this, we can find that this is a known issue within our product. The product team has been made aware, and they are actively working on it. At this point in time, we have no final date available as it is too early in the process, hence ETA is still unknown. We appreciate your efforts in reporting this issue.
Please make sure you keep Office up to date by relaunching it often to take advantage of feature updates as well as product corrections. We appreciate your kind understanding regarding this matter.
Our apologies for the inconvenience this have caused to your productivity. You may switch the toggle "New Outlook" off (top-right), to revert to Classic Outlook, if this feature is critical to your work.