Dear Elena Rogojina,
Good day to you and hope you are doing well.
We do understand your concern but as this is related with product design, so need to submit feedback to them and will surely raise your concern to our Product Development Team for this feature. Also, Product development team, updates Outlook for Mac related all new updates on Microsoft 365 Roadmap | Microsoft 365, so once this feature will be in development phase, you can find it from here. You can also check this site to check all new updates for Outlook for Mac.
Also from this thread we have observed that Libeamlak provided required information regarding your query. Since Libeamlak continue supports you and provided required all information, so here we will summaries this entire post. You can also give vote on this; it helps other users who are finding such information.
Question : Recall message in Outlook for Mac
Answer : There's no feature to recall sent email messages in any version of Outlook for Mac. If this is a feature you'd like to see in future versions, please send us your feedback to help us prioritize new features in future updates. Can I recall a sent email in Outlook for Mac? - Microsoft Support
How to submit feedback : Outlook > Help > Give feedback
Other information: To check new updates for Outlook for Mac : Microsoft 365 Roadmap | Microsoft 365 (Note: with select filter option in Product and Platform, you can also check updates for other products**).**
We appreciate you precious time on this post and thank you so much for your kind cooperation.
Sincerely,
Ankita Vaidya | Microsoft Community Moderator