It could be helpful to check if your gamepad is properly recognized by your operating system and if the drivers are up to date. Also, verify the Unreal Engine settings for gamepad inputs and make sure the right buttons are mapped to the right actions in the viewport. You can also try resetting the input settings to default and re-configuring them. If these steps don’t resolve the issue, try using a different gamepad or connect it to a different device to isolate the problem.