While I've been messing up with my Android project in Android Studio, I had this "unneccesarily troubling" issue. On my main project (fig. 1) which I've been copying files from my test project (fig. 2) -for extra code safety- ; mipmap folders appear for every resolution seperately with resources in with corresponding resolution. 
But in my test project, which I've added these icons using "image asset" option instead of good old copy-pasting technique, these icons appear as icon folders with every resolution of them inside.

What causes this difference and how can I resolve it?

[![Type One](https://i.stack.imgur.com/LqrD0.png)](https://i.stack.imgur.com/LqrD0.png)

Fig 1: Main project with copy-pasted mipmap folder from test project.

[![Type Two](https://i.stack.imgur.com/mJS4S.png)](https://i.stack.imgur.com/mJS4S.png)

Fig 2: Test project including icons added with "right click on 'res' folder > new > image asset" option folder from test project.

Also, I'm open for grammatical improvements.