Now that the Library filter box has been widened to take up the whole width of the window, the (X) being over in the right end is rather in convenient. Most of the time you're working over on the far left, typing there, clicking to move the insertion point to fix something, etc. Having to move the mouse all the way over to the far right to clear the text and then back again is a pain. (Yes, I know, one can do Ctrl+A then hit Delete, which might be quicker; but what's the point of even having a mouse way of doing too it if it's inconvenient?)