Unfortunately with Hal 6 it appears you can only increase the size the of the character, not decrease it. This is done on the main chat window in the box were the character resides you'll find a "Size" drop down menu. If the character is too big where it's partially obstructing your view of the text fields you can try increasing the Hal's window size. This is done by clicking the "menu" button on the chat window and selecting "Window Size..." from the list. You can also change the window transparency the same way, you can't change transparency in the general options, it must be done by selecting the "menu" button from the chat window.
