I am not sure if this will help anyone or not, but if you ha e an android phone there should be a "menu" button right next to the URL. When you scroll down and the URL bar pops up, so does the menu button. If you click that there is an option to enable websites in full mode or in mobile. I change mine all the time depending on the site. Nearly all smart phoned have this option, but I am most familiar with the android. If you need help with a different phone you should be able to google it, I can be of some assistance if need be.

Again, not sure if this will help anyone or if it is what anyone is wanting, but it will only change the setting on your phone not on your PC as well. I noticed a lot of people having trouble with going through the site to change it, and then it not working on their PC correctly.