Exiting multiple open positions at the same time, that is squaring off multiple open positions at market price at the same time, will be available in the new web version of Kite.
What you need to note here is that multiple position square off will happen at market price. Market orders are permitted only for index options but they are blocked for stock options due to low liquidity. Hence, you will only be able to square off multiple index option positions at the same time. When it comes to stock options, you will still have to square it off one at a time.