No "option" button when import stl as solid

guys,

I have been searching for the web for long before I posted here since I did get any result.

I wanted to import a stl file into solidworks as a solid. Many threads said that there is a button "option" where I can set to import as solid.

But I indeed found no "option" button to do so as the attached image shown.

Can anybody help? much much thanks!!