Switch the value of gravity based on an action event

Hello friends!
As the title says, I am looking to have a button mesh in a room of my project that when pressed, disables gravity. The game I am making is space themed and therefore I would really like to get this working as a means of cutting power to the gravity generator. I am struggling a bit with this, for I only use nodes to code and there is no existing node (to my knowledge) that is as simple as “gravity direction” or “world gravity”. I would like this to be applied to all actors in the level. Meaning both objects and players. Any help would be greatly appreciated!!!