"Top" bolt release = "side" bolt release

The only other type of bolt release is "bottom" bolt release. If yours was "bottom" you would understand... the bottom bolt release is built into the trigger guard and slides backwards and forwards.

Yours is on the "side" of the action AND on "top" of the stock. It is pushed down to release the bolt. Thus, "side" bolt release is the same as "top". Samo-Samo.