In the Canvas Layer Editor window click the eye icon for the image layer.
To make it easier to sketch on individual image layers, you may want to hide some image layers while you are sketching. You can then show these hidden image layers when you are finished.
Visible image layers are listed in the Canvas Layer Editor window with an icon. Hidden image layers are listed with an icon.
In the Canvas Layer Editor window, click the icon of the image layer you want to hide.
The icon becomes an to indicate that the image layer is hidden.
To hide all image layers except the active image layer
In the Canvas Layer Editor window, click the icon.
This hides all other layers, and enable you to work on the layer of your choice.
In the Canvas Layer Editor window, click the icon of the image layer you want to show.
The icon becomes an to indicate that the image layer is visible.
See also Customize the mask display.