Using the New Outlook for Mac features in business environments
Hello Malisha Awunor,
Welcome to the Microsoft Community.
I understand that you are experiencing an issue when replying to emails in the New Outlook for Mac.
In fact, when you click reply, a horizontal line does appear to separate your reply from the original email content. Some field headers from the original email, such as sender, recipient, CC, and subject, are displayed in bold text.
If this is what you are referring to, then it is normal.
If this is not your issue, I hope you can provide a screenshot so that I can better understand the situation you are encountering.
Please feel free to let me know if you have any further updates, thanks.
Best Regards,
Zachary.W - MSFT | Microsoft Community Support Specialist