7.19. Layer to Top
The Layer to Top command raises the active layer to the top of the layer stack. If the active layer is already at the top or if there is only one layer, this menu entry is insensitive and grayed out. If the active layer is at the bottom of the stack and it does not have an alpha channel, you cannot raise it until you add an alpha channel to it.
7.19.1. Activating the Command
You can access this command from the image menubar through Layer → Stack → Layer to Top,
or by pressing the Shift key and clicking on the up-arrow icon at the bottom of the Layers dialog.