command makes the top
layer in the stack the active layer for the image and highlights it in
the Layers dialog. If the active layer is already the top layer in the
stack, this menu entry is insensitive and grayed out.
Note that on a standard Windows-style English keyboard, the default
keyboard shortcut Home does not refer to the key on
the numeric keypad, but to the other Home key in
the group of six keys to the left of the numeric keypad.
7.13.1. Activating the Command
Or you simply click on the layer name in the Layers Dialog.