Nikon D3300 Reference Manual page 160

D
"A" (Auto)
Results for auto sharpening, contrast, and saturation vary with
exposure and the position of the subject in the frame.
A
The Picture Control Grid
To display a grid showing saturation (non-
monochrome controls only) and contrast for
the Picture Control selected in Step 2, press
and hold the X button.
The icons for Picture Controls that use auto
contrast and saturation are displayed in
green in the Picture Control grid, and lines
appear parallel to the axes of the grid.
A
Previous Settings
The line under the value display in the
Picture Control setting menu indicates the
previous value for the setting.
140 P, S, A, and M Modes