GS L nL nH
Sets the left margin using nL and nH.
The left margin is set to [(nL + nH × 256) × 0.125 mm].
This command is effective only when processed at the beginning of the line in
standard mode.
If this command is input in page mode, the printer performs only internal flag
operations.
This command does not affect printing in page mode.
If the setting exceeds the printable area, the maximum value of the printable
area is used.
GS W nL nH
Sets the printing area width to the area specified by nL and nH.
The printing area width is set to [(nL + nH × 256) × 0.125mm (0.0049”)].
This command is effective only when processed at the beginning of the line.
If this command is input in page mode, the printer performs only internal flag
operations.
This command does not affect printing in page mode.
If the setting exceeds the printable area, the maximum value of the printable
area is used.
It’s related to the actual print width.It can be set different in different printers.