Canon eos rebel T2i - Manual (Page 111)

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Function settings particular to Live View shooting are explained here.
While the image is displayed on the LCD monitor, pressing the
button will enable you to set the image-recording quality, drive mode,
and AF mode. In Creative Zone modes, you can also set the white
balance, Picture Style, and Auto Lighting Optimizer.
1
Press the <Q> button.
X The settable functions will be
highlighted in blue.
When is selected, the AF
points will also be displayed.
2
Select a function and set it.
Press the key to select the
function to be set.
X The setting of the selected function is
displayed at the bottom.
Turn the <6> dial to change the
setting.
Shooting Function Settings
Q Quick Control
COP
Y