Hi Mary55ee,
I sincerely apologize for not being able to answer your concern in a timely manner. We are currently experiencing high volume of inquiries. I understand that you have trouble using the new Outlook interface especially when composing an email. Let me help you with that.
With the current design of Outlook, the option to change the font size in the subject line is still not available. I also simulate your concern and I found out that the maximum character that you can type into the subject line is 1023. You can also use "Copy", "Cut" and "Paste" options in Outlook. Just right click in the message and then select "Copy", "Cut" or "Paste".
If you have other concern regarding the new Outlook interface, don't hesitate to inform us and we are happy to assist you.
Note: The title of this post was edited to help other customers find this topic easily in their search results.
Thank you.