Are you sure that you are using the 2018 software?
Look at the top of the desktop program screen, it should indicate the Edition and Year, ie TurboTax Premier 2018. Or click on Help and About...will have the Edition and Year.
If you have the correct software then make sure you have updated to the latest release. Click on Online at the top of the desktop program screen. Click on Check for Updates.
The 2018 TurboTax desktop edition does show 2017 and 2018 as the tax years on the Rental Summary Screen. And when entering actual expenses or actual income.
