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How i can force desktop version to mobile nameless site?
I'm not quite sure that I understand your question sorry - Nameless will automatically scale to the device you are on, for example on a desktop you will get the fullscreen page and if you shrink the web browser you will end up in the tablet and then mobile view.
You can install another style which isn't responsive to force desktop view on mobile devices. You can also trigger the "view as desktop" option on your mobile device to load the desktop version.
However, there's no way to simply disable the mobile view because those device-width breakpoints are coded into the stylesheet which isn't configurable.