Settings Menu; A/V Output; Aspect Ratio - D-Link DSM-750 - MediaLounge High-Definition Draft N Media Player User Manual

Section  - Configuration
The following options are available under the Settings menu:

A/V Output

Network
Under the A/V Output menu, you may change the Aspect Ratio to
either Normal (Standard Televisions) or Widescreen (Widescreen
Televisions). Please make sure you understand the ratio of your
television screen before changing the aspect ratio, or you may get a
distorted picture.
D-Link DSM-750 User Manual

Settings Menu

Slideshow
System
A/V Output

Aspect Ratio

Extender
1