You can reset the copy function you changed to their default settings in the following ways.
Auto Reset
If you do not perform any operation for a certain period of time, all the copy settings for your copy job return to their default settings. The auto reset time is set to 3 minutes by factory default.
Memo
To set the auto reset time, press the 
(SETTING) button on the operator panel and select [Admin Setup] > [Manage Unit] > [Operation Clear] and set [Operation Timeout].
Using the 
(RESET/LOG OUT) Button
Press the (RESET/LOG OUT) button on the standby screen or setting item screen to initialize the copy function.
Memo
When copying is complete, press the (RESET/LOG OUT) button to reset the default settings for the next user.