Hello Community,
You can try to go to “Editor Preferences” → Inside the “Level Editor” open “Play” → Search Multiplayer Options…
Inside of multiplayer options there is a “Client” tab → Tick the box “Route Gamepad to Second Window”.
Back to the Play Button to simulate a game → Expand the button with the little arrow →
Write “2” inside of “Number Of Player” → Set the “Net Mode” to “Play as client”…
Make sure you assigned “Input Actions” and “Axis Actions” to a gamepad.
Did that work for you?
Greetings