I simply wish to knit a document to PDF using rmarkdown in RStudio. I don't understand what has happened, but when I select knit, it no longer shows the different knitting options (e.g., pdf, html etc.) and just automatically knits to html every time (see screenshot). Only 30 minutes ago I'm sure the option was right in this dropdown menu, and I have previously successfully made the document into a pdf. Is there something I can do to get back the option to knit to pdf?
