I filed FL taxes for 2018, because we own a rental property. When I went to print them as instructed a one page document populates with instructions and nothing more.

Florida does not levy a state individual income tax. You do not need to file an income tax return with the state.

The Florida return in TurboTax, Form DR-405, is to report tangible personal property used in connection with a Florida-located business or rental real estate and is printed and mailed to your county property appraiser's office by April 1st.

 If you do need to file a DR-405, nothing will print unless assets are transferred or you manually enter assets in the DR-405 worksheet.

Florida does not tax personal income and never has. You have absolutely no need to be filing the DR-405 either.