Connect controllers to bluetooth on PC
In Unity – New Project
Window > Package Manager > Input System > Install
Select Yes:

Add the asset:
https://assetstore.unity.com/packages/tools/input-management/controller-tester-43621
Map Axis 1
To try multiple controllers, import the SimpleMultiplayer project:
As each controller provides input, it splits the screen automatically and shows each player their own camera / pane