This is due to the fact that the app only runs when you start it, after which it minimizes all of the windows that are currently inactive and then shuts itself. There are no settings to worry about with Activator, and it doesn't take up any memory. To create a completely clean desktop environment, try pairing Activator with something like Clean Master or Clean Space. Activator's major selling point is its ease it doesn't accomplish anything you couldn't do yourself, but it does it more effortlessly and fast. The goal is to provide a clean, distraction-free working environment with minimum effort on the user's side.

Activator is a portable program that minimizes all inactive windows, leaving only the one you're working on open.