The Option Chain shows the available options for the selected symbol that is loaded. To the right of the symbol you can modify the Expiration Month.

To the right of the Expiration date you will see following displayed: Last, 5 Day Historical Volatility (HV), 20 Day Historical Volatility (HV), 60 Day Historical Volatility (HV), 90 Day Historical Volatility (HV), Continuous Implied Volatility Calls, and Continuous Implied Volatility Puts.
Using
this option on the Option Chain,
enables the Option Chain to be taken out of the main program
window. It then can be moved and resized anywhere on the screen. When
the Page is saved the window(s) that
are outside of the main program will be saved in those locations as well.
This
is what will be shown when a window is currently being 'Floated' outside
of the main program window. To
return the window 'Floating' outside of the main window click on the Dock
button.
Clicking this option will drop down the color link window and link the current window with any other window that is using the same colored link.