Hello Mehreen,
why would you include an indicator in your strategy and then select OFF? I do not see a reason why there should be such an option at all.
When you backtest trading strategy you use all the indicators included. If you disable any off them, you will be changing the strategy performance. It will give you a different result. If you do not want to use an indicator in one strategy just do not include it. It really does not make sense to include indicators into a strategy and then to disable them.
If you want to backtest trading strategy with or without any indicator just make 2 Expert Advisors and compare them. This will be even better. If you switch ON and OFF indicators from a strategy you will never understand is that a profitable strategy or not. Your statistics will not be precise.