"excel allows for flexibility to fit your specific requirements, and the options on the settings tab change to reflect the selected area"
my first question is: "is it possible to finish english language's different sentence structures"? i know the uses of "allow", for instance, allow someone to do something;but what is this "allows for flexibility"?. i understood the entire sentence completely but i fed up with different suprises of english language as it is very rich in different ways of expressing ideas, i am not kidding.
my second question is: in that sentence why "change" is without "s" despite the fact that it refers to "settings tab".
thanks for your answers.