MATLAB general question regarding Save on editor window ?

Hello Guys,

Whenever i am in debug mode if i accidentally press any button and then click the save option on Editor window a dialogue box always appears "do you want to save changes", and a checkbox button below "don't show this message again", so i clicked that checkbox and clicked the save option. How do i get it back the option/dialogue box ?. I checked in preferences but could not found the option ? Please tell me.