You can view and manage layers in the Layers panel.
With the Layers panel active, click the light bulb icon to the right of the layer name.
With the Layers panel active, click the color icon to the right of the layer and choose a color from the palette.
You can choose from the colors that are already in the drawing, or from the colors available in the AutoCAD color index.
Click Create new below the list of layers.
Click the lock icon to the right of the layer name.