Can I extend my Switzerland Visa from UK during my Switzerland trip?

No, generally you can not extend your Switzerland Schengen visa from UK, because it can only be extended in unforeseen situations like:

• There are health emergencies where you can not take your flight.
• In any major natural crisis, like an earthquake, a cyclone, or a flood.
• If there is a situation that is human-made, like war or any political issue.