how do you decrease the size of ‘from’ address field so the subject field is longer?

It is frustrating to say the least.  I don't need to see a full from address.  I want to see the full subject in my inbox.

The only part I can adjust is the left side, where the folders are.   Of course we can't slide over on the right, as far as I can tell - Microsoft doesn't want us to cut out the annoying ads over there.