Yes. You will see a preview of the document immediately after you have filled in all the required fields. If you want to make any edits, just click on the appropriate section in the screen's left corner. All changes made are saved automatically.
Also, note that the documents you generate in the GetCoverLetter simple resume builder are stored in the library. It applies to both ready-made resumes and drafts. Accordingly, you can return to work in the editor at any time and continue writing.