activity_main.xml和activity_main.xml（v14）

I've created a duplicate file of my activity_main.xml. Why? Because I was trying to solve a problem regarding the minimum API required. So there's that red bulb notification in android studio, I clicked that, and applied the possible fix. What it did was it created that second xml file. Now, it's no use since I solved the problem in another why. This time, I'm editing the original xml file. However, when I run the program, it will display the layout of the duplicate xml file. What should I do?I've created a duplicate file of my activity_ma