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.
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.
In the Canvas Layer Editor window, click the icon.
All layers become visible again.