Getting to Know the Work Area - Adobe Illustrator CC - page 9

Note
On Mac OS, you won't see some of the options you see in the figure
(Windows), and that's okay.
3. Drag the Brightness slider to the left until you see a value of 50%.
You can drag the Brightness slider beneath the Brightness menu to the left or to the
right to adjust the overall brightness using a custom value.
4. Choose Medium Dark from the Brightness menu.
5. Select White for the Canvas Color option beneath the Brightness slider.
The canvas is the area outside of the artboards in your document.