The unity, why change the old (standalone) builds settings.

I work on a project that has a few (standalone) test builds. But when I made the last one, I changed the settings, such as eg resolution and material. However this setting applied to all others, which I created ago. Why? Each build, using the same directory to store the settings of? Why can change the material settings after building? When I publish the game, then what will be the setting?