If the Xbox controller is turned on and connected to your computer when the 3D View is first opened, then it will automatically connect and control the movement of the camera with the controller. If you connected to the controller after opening a model, close and reopen the 3D view or the model in order for the controller to connect.
If you want to change what the controller sticks and buttons do, you can modify the FlexScript code in the node VIEW:/standardviews/documentwindows/Perspective>eventfunctions/XboxInput
If you want your changes to that node to persist when you close and reopen FlexSim, then you can make a module that replaces that node using the Module SDK.
In one user's experience, the Xbox controller worked with FlexSim 7.7 but not FlexSim 16.2.
If you experience that issue, you can delete the file C:\Program Files\FlexSim 2016 Update 2\program\XInput9_1_0.dll so that FlexSim uses the XInput dll from Windows instead of the version that we install with the software.
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