Questions About Cortex

The whole launcher scenario for PC gaming has gotten incredibly out of hand lately. I was interested in the Universal Launcher option offered by Cortex, but was wondering, as someone with a library large enough they don't keep all their games installed at once, if game detection by the software was only for games physically installed on the system or if it was able to gather all games linked to each account (ie Steam, GOG, Origin, etc). If it's the former, and the game has to be physically installed for detection, if the game has been detected once and added to the launcher and is then uninstalled, will it remain in the Cortex Launcher? I can't possibly have all my games installed at once, and so I'm curious how this is handled.