Unwanted verbose headers with every email

I have used Eudora for years, and have the latest version before support was withdrawn.

My emails always came to screen with just the minimum address and sender information unless I clicked on the 'Blah-blah' icon to summon full header history---which I hardly ever needed to do.

Now every email comes up with half a page or so of headers I have no desire to see.

How can I avoid this?