Epson Stylus Pro 4000 Reference Manual page 84

Auto Rotate
Note:
This function is not available when Roll Paper (Banner) is selected as
the Paper Source.
This function is effective only when the print data length is shorter
than the printable width of the roll paper. The print data will
automatically be turned 90 degrees to print crosswise, saving roll
paper.
Original
To enable this function, follow these steps.
1. Select Auto Rotate. The Roll Paper Width button is activated.
2. Click Roll Width. Roll Paper Width dialog box appears.
3. Select the installed roll paper size from the pull-down menu.
4. Click OK.
84
Printing with Windows
Auto Rotate off Auto Rotate on