The heavy weapon property is described as follows:
A heavy weapon’s size and bulk make it too large for a Small creature to use effectively.
And in the description of the Enlarge option of the enlarge/reduce spell, it states the following
The target's weapons also grow to match its new size.
This implies that the weapon grows along with the target, and thus the weapon would still be too large to wield.
I could not find anything on large weapons other then heavy weapons giving disadvantage on attacks when wielded by Small creatures.
So does enlarge remove the disadvantage from the heavy weapon? Or does the weapon grow with you and then would still be to big to wield?