The new Yahoo Messenger is awful and very limiting. You can't change preferences. I do not want to show the images of the users and it takes up space. I have always used the compressed/compact version. Now this new version is bulky and lacks control.  Even the new version of Yahoo Finance is awful.  Just because everyone is moving toward mobile, doesn't mean Yahoo should dump the things that were working well before and try to make everything fit for mobile.  This is a big mistake.  If they want to change the format completely allow the users to choose the format. Yahoo can then see which version is being used more.  These supposed new improvements are a big step backward.