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Nice rig I had one several years ago and if it's the same as my 817:
press 'F' momentarily
rotate the 'sel' knob until you see 'DSP' above one of the A B C buttons under the display
toggling that button should toggle large/small display
You might have to do a complete reset of the main processor...you will lose memories and such but that would put everything back to factory default status...
All the Best
BJ
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