When posting to threads, how to I eliminate the extra space in my post?

[Catbert]

I notice when I make a one sentence post (or even more?) in a thread, the post box remains big. Is there any way to shorten the box in my settings? Seem like a lot of wasted space that makes one have to scroll a thread more often than necessary.

[Catbert]

Hmmmm....now that my brain has some coffee to stimulate it this morning, it would seem that the size of the message rectangle is determined by the size of the avatar and other information on the left side of the thread! AhHa! Brilliant observation, my dear Watson!

[PennyGuy]

By jove I think he's got it! LOL

[Catbert]

Brilliant observation, my dear Watson!

And, to correct myself again, Mr. Holmes would have said "Elementary, my dear Watson."