Something weird just happened. I wrote a longish post (several lines) in another thread, wanted to see all of what I had written so I could proofread, so I grabbed the "expander" and dragged it all the way to the right -- only I dragged it too far, and ended up with the result that I could no longer drag it back, and some of my words were no longer visible to me on the extreme right. I had to post the message to be able to proofread it.
Nope, don't like this feature at all!
Time to build a bigger bridge.