Let me add my voice to the chorus, even though this is an older post. This US-only default in searches is driving me crazy. I hope that Upwork will consider letting us specify whether we want it as our default or not. It will ensure that we don't miss potentially appropriate jobs that just happen to be in another country.
This problem has now also reached the UK. The biggest violation of Upwork is that when you set a bookmark to the normal job feed, this is overriden and you are forced back onto the domestic feed. If it was really a "feature", this would not be the case and developers would be allowed to have a choice, at least from a URL perspective.
Please make the URL's for the domestic feed and normal job feed distinguishable to not force freelancers onto whichever feed Upwork decides.