Kinematic Character Controller Escaping from Game or Pause Game Mode to return to Main Menu

Hi,
I just started with creating a menu and a game mode using the KCC. I would like to return from game mode to menu but there seems not be a Keyboard shortcut for escaping from the game. The asset also seems not to use the new input system. How would I add this keyboard shortcut or can I replace the old input system with the new one? Thanks