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The only time these settings would need to be edited would be to use the camera rig in Igloo Spectator mode, whereby it would use the NDI output system rather than Spout.
Changing the output to NDI
Firstly create a new IglooSettings.xml file by launching the Settings Wizard by either clicking the Open Settings Wizard button on the Igloo Manager component, or clicking Igloo → Settings Wizard from the top bar.
Click Create Default configuration
Expand the System Settings sub menu
Uncheck Use Global Display Settings
click Save
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Press Play and then Stop once everything has loaded. This will make Unity create a IglooCameraSettings.json file for you in StreamingAssets.
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