After you file

I save every time I work on my return say for 30 minutes.  I also save when ever I get off it.  I have finished my return but I have not filed it yet (2020).   I went back into it tonight and I see 3 copies to select from.  I am able to open all three and they are complete except for filing.  My subdirectory on my hard drive showed two .tax2020 files and one .pdf file.  So I deleted on of the .tax2020 files.  However, when I go into turbo tax I still see three copies that I can open.  How do I delete two of them?  I also copied one to a flash drive for back up purposes.