I'm new to Facebook (yes, that is still possible!). Yesterday, when I registered, Facebook chat in my account was tiny (about  1/5 of screen height) and showed only true on-line Friends.Today, though I'm pretty sure I didn't change anything, I have Facebook chat as large sidebar, stick to right margin of browser, it is as high as my browser window, and shows all (most) of my Friends, not only those, who are on-line (others showed with time of last activity).What did I switched or which Facebook option controls this? Can I revert to old (yesterday) tiny little chat box? I don't see anything in Chat's settings (knob  icon) or in my account's general settings.
Revert changes done to Facebook chat
facebook;chat;facebook chat
This is based on your browser size. Beyond a certain width, the chat window merges with the Facebook ticker. You can probably get your browser real estate by closing that window.