Hi Pankaj!
I think you have not understood the question or rather, I have not explained myself well.
I know which style is 1 and which is 2.
Before modifying I have made a copy of the original Watch Overview module. Then I changed style 1 to style 2.
When I wanted to return to the original state I find that it is not possible. Now I have restored the copy that I have made previously and it works, it could not be otherwise.
Conclusion:
it is necessary to make a copy of the module because there is no possibility of return of this one.
If you have something to tell me, please do it, if not close the thread please.
Regards