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When working with a number of layers, color coding them can help you quickly distinguish one from another. It also helps you group content to create one visual component. Say you’re designing a car. You could assign all components that make up the steering wheel one color. For the tires, you assign another color. Then, whenever you want steering wheel components, you look for layers with the same assigned color.
Visually organizing layers in Sketchbook Pro for desktop
At the bottom left corner of each layer is a circle 
. Tap it to access a marking menu of available colors. Select a color to assign it to that layer, making it easier to distinguish it from the others.
Visually organizing layers in Sketchbook for mobile devices
Tap a layer to open the Layer Menu. At the bottom of the menu, tap Color Label and select a color from the list. Now a colored spot appears in the lower right corner of the layer in the Layer Editor, making it easier to distinguish it from the others.
