I created a new option chain page layout within TWS and couldn't figure out how to simply change the underlying stock symbol to get a new option chain for a different stock. Well, apparently, the "clear all" button which is along the top of the chain is not visible if you have TWS on a single monitor at 800x600 display setting. In order to see the "clear all" button", you must drag the edge of the page and extend it onto your other monitor (if you have one). This allows you to hit the "clear all" button" and start with a fresh underlying stock symbol and its corresponding options. Just thought I'd let others know about this in case someone else was as stumped as me. Good luck.