You are correct in that you need to file a short period return.
In cases such as this, you would use the 2019 forms (assumes no 2020 forms have been released) and cross out the 2019 and manually add 2020 on each form. As a result, you would then need to paper file the final return.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
