Selecting one image for Print to File

I am using the latest version of LR on a Surface. In the Print Module I want to Print to File because I want a specific print size. I select the image and see it is selected in the # 2 display window but when I select a folder and execute LR Prints all these images I don't want. I seem to have some kind of select all. But where? Where do you find the button that allows you to select the image for print to file?