How do enzymes manipulate the collision theory of chemistry?
They manipulate a number of components of reaction mechanisms. See Below
Enzymes can distinguish between enantiomers of a compound, so if we extend this idea, we have a sort of an answer.
Binding a substrate in a specific way (with exact binding pocket geometry), can allow the reactive portion of the molecule to be present to collision, instead of the nonreactive portion. That way, collisions only occur between the region that is intended to react.
Enzymes work by the idea expressed in the saying, "the straw that broke the camel's back". Many forms of transition state stabilization are utilized, like electrostatic effects, orbital steering, covalent catalysis, acid/base catalysis - as well as manipulating collision theory (by positioning the collision-susceptible portion of the molecule in a manner that allows it to be collided with).