Create new windows when running casues UE unable to recognize two/multi gamepads

I am developing a virtual filming project that users use two or more gamepads to control the cameras. So users want to see their own windows. I find a plugin that can create multi windows when running. However, if I create windows, UE then can not recognize my two gamepads. But if I do not create window, just split the main viewport, UE can recognize my gamepads and each gamepad can control one of the four player’s cameras.
There is a same situation in online multi players game. Since online multi players game has multi windows when running(client or standalone or else), UE cannot recognize my second gamepad.
Does anyone knows how could I solve it? No matter Blueprints or C++. Thanks

Here is the screenshots


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