JAVA Beginner -"compiling.java" not found

I am unable to trace the file “Compiling.java”
Don’t understand how to locate the file. where is it actaully getting stored ?
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Hello World | Codecademy

The exercise is divided into three panes. The instructions are on the left, the editor is in the middle and the bash terminal is on the right.

The name of the file you are editing is shown at the top of the editor. For this exercise, you can see that the title of the file is being shown as Compiling.java.

You don’t need to locate the file. It is already open in the editor.
If you inadvertently close the file, you can click on the folder icon (top left corner of the editor) and browse the folders and files.