Pioneer R1 Instruction Manual page 13

Note: in any application program, you can press the homepage key
to return the homepage interface.
Outstretched homepage interface
Homepage interface may extend beyond the width of screen, so as
to provide more space, so that you can place the newly increased
shortcut, widget, etc. Press blank of homepage interface, then slide
around quickly in vertical direction by finger to jump to left side or
right side outside the screen. There are more than 2 stretched
pictures on the homepage interface.
10