Hello,
The Launch Character function automatically sets the character to the Falling mode. This function is used mostly for jump pads and the like, which means it has very specific use cases.
Here is the documentation on the node for reference: https://docs.unrealengine.com/latest/INT/BlueprintAPI/Pawn/Character/LaunchCharacter/index.html
If you’d like to explain in more detail what it is you’d like to accomplish, I’d be glad to see if there are alternative solutions that we can come up with to get you the desired results.
Have a great day