When you start PDF Plain Text Extractor. The typical layout is like the picture below. upper-left panel, upper-right panel , lower-left panel, lower-right panel will be defined here and will be refered in this document.
This is the Menus.
This is the toolbar
This is upper-left panel, you can browse the drives and folders here.
This is the lower-left panel, when you navigate into a folder in upper-left panel, the pdf files in this folder will be listed in this panel.
This is the upper-right panel, the pdf files you added to the converting list will be listed here.
This is the lower-right panel, when you navigate in upper-right panel, the highlight pdf file's information will show in this panel.