Here, I took the previous screenshot (which I left "un-massaged" so you could see it), and took a few minutes to "massage" it -- I deleted callouts I didn't need, moved the remaining callouts around, adjusted some of their names, and re-numbered them. And just to illustrate what a typical documented window might look like, I added short descriptions in the sections below for each callout. This whole process took a little over 10 minutes, including writing this paragraph.
"Save in" Drop Down
Use this drop down control to select where you would like the file list to be focused.
This is called a "Combo Box" because you can type your file name directly into it like a text box, or use the button on the right to display a drop down list, from which you may select from a history of of previously used file names.