ThinkorSwim Question about chart appearance

Regarding the ThinkorSwim interface: What does the alternating shaded background indicate, correlated to time axis, on charts, when the time period is changed to less than a day? Is there a way to toggle this on and off?

Thank you,

Rob
 
long ago changed the defaults on mine, but from what I remember if you're looking at a stock off hours are shaded differently from hours when the exchange is open.
 
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