I wouldn't do anything... why would you want to?? The only technical issue is the wire isn't at the correct strip length. But on main lugs this isn't unusual and doesn't pose much of any safety hazard. Just keep bare ground wires away as they should be.
And that's really the only time there's really any danger. Because even if the feeder was stripped to fit the lug just right, the lug is still exposed no matter what. Anything more than 1/2" from the lug is unprofessional on the installers part.
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