Hi, VeasnaYim!
I'm really Sorry for the late response, did not see this post for some reason.
The XST is a log file generated by the machine if job logs is enabled, it can be disabled in Centreware under Scan -> Template used -> reports or report logs.
If you're using a print server, changing the settings in Start -> Devices and Printers -> Printer Preferences -> Advanced -> Printing Defaults to one sided print, on the server and then pushing the driver out to the clients will result in all clients having one sided print as the default option.
Best Regards
Kimzi
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