An enzyme cannot change the distributions of products and reactants, that is, it cannot alter their relative energy states.

However, recall that enzymes accelerate reactions (in both directions).

Reaction rate is related to activation energy (the harder homework is the less you want to do it), and so a decrease in activation energy will accelerate a reaction.

It is a really interesting thing, but enzymes do actually bind to and stabilize a transition state to reduce activation energy and accelerate a reaction. This is not to be confused with binding to the substrate or product, which would change the overall reaction energy and therefore your distribution of products and reactants.