Using New Outlook on Windows for professional communication and productivity
Hello,
If I understand correctly, the size of your message body in the new Outlook is too tiny for you.
If that is the case, you have to change the font size from its default to what you want.
To do that, Go to Settings on the Outlook page.
Click on Email on the left pane.
Click on Compose and reply.
Scroll to Message format and select the font size of your choice.
Click on Save.
Please try the steps above and let me know if it helps.
Kind Regards, Rita.