There is no mobile setting when you go to surf the web most sites open to the regular page. Now if you WANT to do mobile view at the bottom of each site you want to go too, there is an option that you press. There you will find options to how you want to view the site. At least that is what I see. I have not found any options in the settings.
I have this issue with Facebook sometimes. Even if I go to Welcome to Facebook, it takes me the mobile view site. If I then scroll to the bottom of the page and opt to view the full site, only then will it take me there, but it'll take me to my top news, and clicking on "most recent" does nothing. I usually have to refresh the page a couple times or attempt to load it again before I can get into my most recent news. I chalked it up to a quirky browser, but it's the same deal in both the stock browser and Dolphin, so maybe it's a quirky Facebook thing.