Here’s a teeny tiny Did You Know that I just discovered:

You can change the size of the chat window!  I feel silly that I never knew this, but glad that I just found it.  At the bottom right of the chat window, there is a tiny stripey triangle that you can click and drag to change the size and dimensions of the chat window.

Some more basic information about the chat window:

You can move the chat window by clicking on General and dragging it wherever you want it.

You can view more than one type of window at a time (eg. General and Combat), by clicking and dragging any tab other than General to wherever on the screen you would like it (demonstrated in the screenshot below).

You can add (and later move around) new tabs by right clicking any existing tab and selecting “Create New Tab”.  Once your new tab is created, right click it to rename it, change the filter to display whatever you want it to display, and even change text size/colour for different types of chat events (for example, messages from your fellowship could be a different colour from messages in the /advice channel).

To reintegrate a window that you have separated from the main window, simple click and drag it back to the main window until the tab header turns yellow (as seen in the screenshot below).