The Edit > Select All menu command selects the contents (that appear on the right) of the drive or directory folder selected on the left.
The Edit > Select All command function can be duplicated by the following:
Alt + E, A key sequence
Ctrl + A
Note: The automatic copying of text only works when text is selected with the mouse, and not the keyboard, therefore Automatic Copy of Selected Area is not available in conjunction with the "Select All" feature.