Mr Froggy:
when scrolling through the game lists, and this might be dependant on the theme you are looking in, press the left key or on a controller hit left on the left stick which should show a quick-scroll menu containing search, manual filter, favourited A-Z.
using the manual filter you can select PLAY TYPE contains "Multiplayer", which will then filter all your games to multiplayer (through the metadata of each game, so its dependant on that).
its fiddily, and i think launchbox can do better!
I came across your question whilst looking for a quick and easy solution to this too - a quick all/single/multi player toggle from the controller would be really handy considering launchbox is definetly a showoff piece when friends are over, so it would be great to have this filtered ready for a good gaming session and selecting the best game to go with.
good luck!
