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The figure below shows that Disable is selected in [Login method]. 
Select Disable and press OK in the upper left of the screen, and the settings are applied. 
 
 
Screen for specifying default login user 
 
The figure below shows that Enable is selected in [Login method]. 
Select Enable and press OK in the upper left of the screen, and the settings are applied. 
 
 
Screen for setting [Login method]