You can control which fields are displayed and which fields are not displayed on the Jobs window and the Machine window by changing the Xloadl file. Look in the Xloadl file for "Resources for specifying lengths of fields displayed in the Jobs and Machines windows".
In most cases, you can remove a field from a window by setting its associated resource value to 0. To remove the Arch field from the Machines window, enter the following:
*mach_arch_len : 0
Note that the Job ID and Machine Name fields must always be displayed and therefore cannot be set to 0.
All fields have a minimum length value. If you specify a smaller value, the minimum is used.