With the Select Bottom Layer command, you
can make the bottom layer in the stack become the active layer for
the image. It is then highlighted in the
Layers dialog. If the bottom layer of the stack is already the active
layer, this menu entry is insensitive and grayed out.
7.16.1. Activate the Command
You can access this command from the image menubar through
Layer → Stack → Select Bottom Layer,
by using the keyboard shortcut End.
Or you simply click on the layer name in the Layers Dialog.
