Select Setup > Appearance.

Mode

Sets a light background, a dark background, or automatically switches between the two based on the sunrise and sunset time for your current location.

Background

Sets the background image.

Day Highlight Color

Sets the color for the selections made when in day mode.

Night Highlight Color

Sets the color for the selections made when in night mode.

Landscape Controls

Places the controls on the left or right side of the screen when in landscape mode.