MX-1800N (serv.man41). System Settings Guide (Supplied as pdf file on m c's Hard Disk Drive). - Sharp Copying Equipment User Guide / Operation Manual. Page 118

When printing files by batch printing, this setting is used 
to prohibit the selection of the [All Users] key and the 
[User Unknown] key in the user selection screen.
Select the checkboxes 

 of the items below that you 

wish to prohibit and touch the [OK] key.

• Selection of [All Users] is not allowed.
• Selection of [User Unknown] is not allowed.

The default screen that appears when the [DOCUMENT 
FILING] key is pressed can be specified. Select either 
the base screen of document filing mode or the external 
application selection screen. The setting also appears in 
the document filing settings. When the [CLEAR ALL] key 
(

) is pressed in document filing mode or Sharp OSA 

mode, the initial screen of the mode appears, regardless 
of the default display setting.