An Online account or a Desktop return? You can not copy an Online return. And you wouldn't want to. To now file as Single or even as Married Filing Separately you each need to start over fresh with new accounts and new returns and not transfer from the Joint return. Neither of you should transfer from the Joint return.
Was your divorce final in 2018? You both need to set up new accounts and not transfer from 2017. You can't delete the other spouse from it properly. See,
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