Flag outgoing emails not working properly on Outlook for Mac

I am using the new version of outlook for Mac, and anytime I flag an outgoing message it is then flagged for both myself and the recipient (made a test with the recipient being on outlook for windows), and clearly I do not want it to be flagged for the recipient too. How to sort out? I do not have in the drop-down menu where I flag the option to only flag for me, neither it is in the menus