That is the correct function for Adobe when you print a PDF. It is the printing program that allows you to save as a PDF, not Adobe software. You can save to postscript or fax the PDF, but you only save PDF's in Adobe's File > Save option.
If you mean that you "remove from sidebar" it then in the Finder press
SHIFT + APPLE + G keys
paste
/Volumes
Find the HDD you want to have listed in the Finder then drag and drop it in the Devices Area of the finder.
If you did something else start up the Disk Utility App to see if the...