Screw on Main Breaker...question

Is it a issue?

Looks fine, that is required since it is a back-fed breaker that could pop out.

I would be more concerned about over amount of insulation not cut back in the panel and the sloppy work done.

I would be concerned with all of the cables entering in one connector or raceway in the top right corner.

What is the size of the branch conductors , on those 20 & 30 amp breakers ? :smiley: