For a multi (2)-unit property, how do I enter different info for each unit? (1 rented 12 months, 1 rented 4 months) I moved out; is it now converted to rental property?

Home that I have owned for 5 years, has 2 units. Unit 1 has been rented for 5 years, while I lived in Unit 2. In September of 2020, I moved out and started renting Unit 2. Is that now considered converting to rental property? When I choose multi-unit, I can't enter separate info for Unit 1 and Unit 2 (like fair rental days). How should I report this?