Canon imageRUNNER 6570 Reference Manual page 246

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Specifying Common Settings
Select [On] or [Off] ➞ press [OK].
Details of each item are shown below.
[On]: The colors of the touch panel display screen are reversed (i.e., the areas
that are normally light become dark, and the dark areas become light).
[Off]: The touch panel display screen returns to its default colors.
The touch panel display's contrast changes.
Press [Done] repeatedly until the Basic Features screen
appears.