Sony Q READER PRS-500 - Manual (Page 52)

2-680-300-01(1)
Settings
Setting screen orientation
Screen orientation (including menu screens) can be set to
vertical/horizontal.

In the Home menu, press / to select “Settings,”
then press ENT.
The Setting menu appears.

Press / to select “Orientation,” then press ENT.
The orientation is switched from vertical to horizontal.
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