Implementing Gamepad support in UE4 with your game through blueprints can take a lot of work.
here is something i have compiled for you:
First go into preferences > Input > Create a Pause input with the buttons you would like to pause the game with.
Then go into your character BP and create a Boolean, you can call it whatever you like but i felt ‘Is Game Paused?’ Sufficient. then follow the blueprint.
Then Add this to your Menu BP, to enable just pressing a button to unpause at anytime.
This should Resolve your issue.