What are you trying to hide/unhide? Yoy have defined 'Cl = Target.Column', but that just returns a number thatou need to convert that to a letter. But, if you do that and reference Cl for 'Hidden = blHide', what you'll end up hiding is column I. Is that your intention?
Is it only I4 you're concerned with for the column hiding/unhiding? Your code presently tests I4:I33, so any of those cells will trigger that.
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