That's not possible at the moment, but you can simply make two browser windows and drag one to the left of your screen and the other to the right so that they'll be side by side, then you just need to refresh the viewing window when you want to see the new coding.
@ Prate_k as a fellow guide author I would also really appreciate the feature you're asking for. Unfortunately making such a feature can get pretty complicated, especially for guides that are very long and all in one chapter. Making it easier for authors to preview their work is something we're working on achieving, but for now the method MissMaw recommended is your best bet (unless you have two monitors to work with.
Thanks to The_Nameless_Bard for the sig!
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