Moving the Proxy out of the way
If you ever work with the polygon smooth proxy you'll notice that by default the proxy rest on top the polygon you're smoothing, and even with transparency on it can be difficult to see whats happening in the smoothed version. If, when you make the smooth proxy, you uncheck "share tranform node" in the options box you can move the proxy out of the way while still being able to modify the topology. You may need to scroll down in the option box if you don't see this checkbox. Example shown for clarity:
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