Question about Canon PIXMA TR4550

See description of the product at digitec

Document feeder (ADF)

Automatic document feeders (ADF) are used by copiers, printers and scanners. For copying/scanning, it is no longer necessary to use an original glass cover, where each page must first be placed individually on the original glass in order to be copied.
The Automatic Document Changer feeds and then ejects individual sheets from a stack of paper, and there is no need to change the position of an original glass cover.

I have tried to navigate through the menus but have not found such an option :-(