Remove Unwanted Game Systems

[Theocrat]

Hi all -
I am certain that others have this problem too. I downloaded but never use Shadowrun, 4e, Cortex or any of the other systems.
I'd like to remove them from the options screen. I'd prefer to have one that was Pathfinder RPG (with 3PP and house rules), a Pathfinder Society legal only and a Pathfinder Modern option if possible.
I saw a screen of something like this a long time ago but I'm not sure where.
Your thoughts and directions are appreciated.
Theocrat Issak