Samsung SyncMaster 400DXn Owner's Manual page 128

Info Grid shows some basic information necessary to Image Size Control.
1) Click the Video Source tab to adjust Image Size for TV, AV, S-Video, Component, DVI(HDCP), HDMI, DTV.
Click Select All or use Check Box to select a display to control.
2) Info Grid displays only the display having TV, AV, S-Video, Component or DVI(HDCP) as input source.
3) Switch Image Size of the selected display randomly.
Note: Auto Wide, Zoom1 and Zoom2 are not available for selection when the input signal type for
Component and DVI (HDCP) is 720p or 1080i.
( The Auto Wide mode is available only for TV, AV, and S-Video. )
The Input source of MagicNet works only on MagicNet model.
The Input source of TV works only on TV model.
The Image Size Control feature is available only for the displays whose power status is ON.
Time
1. Click Time of the main icons and the Time Control screen appears.