You can just start working through the SCH E section of the program and delete it from there on the rental property summary screen. However, I would also highly suggest you amend your 2019 tax return and convert the property to personal use with a conversion date of 12/31/2019.
Alternatively, you may find it easier and simpler to just convert it to personal use on your 2020 tax return with a conversion date of 1/1/2020. That would stop depreciation and make 2020 the last year you would report this property on a tax return. (Unless of course, you convert it back to a rental on your 2021 tax return.)
