Please try removing the proxy information from the connection settings.
I can see the ThingWorx Experience Server information in there.
However proxy information should be a proxy host that you use on your device to access the internet.
This is something that should affect you company-wide, not only on ThingWorx Studio.
Proxy Server / Proxy User / Proxy Password should be empty
I just noticed that you've opened quite some thread for the same topic.
I think Giri already suggested the same technique in ThingWorx Studio project can’t publish successfully.
Despite that I would just refer to Moritz' document around proxy configurations... it's quite good