Epson EPL-6100 Reference Manual page 141

Note:
Settings made in the Remote Control Panel utility are not effective until
you click Send to download the information to the printer. If you share
this printer, the settings shown on your Remote Control Panel utility
may not reflect the actual settings in the printer as they may have been
changed by other users. Even if the Remote Control Panel utility already
shows your desired setting, always click Send to ensure that you can
print with that setting.
Page Setup button
Click Page Setup on the Remote Control Panel screen and the
following dialog box appears:
Note:
Use Next and Prev to access all available setting options.
Page Size
You can set the default page size here. You should change this
item at the Remote Control Panel utility only if you cannot change
the page size from your application program.
Using the Remote Control Panel Utility
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