4.2. Select All
The Select All command creates a new selection which contains everything on the current layer.
4.2.1. Activate the Command
You can access this command from the image menubar through Select → All,
or by using the keyboard shortcut Ctrl+A.
In addition, at the Selection Editor, you can access it through the Tab menu: Selection Editor Menu → All, or by clicking on the icon button on the bottom of this dialog.