WHC

I would like to be able to open (on the main editing screen) a lateral view of thumbnails of each image from a designated folder, with the option of selecting, from that view, a single image to open in a larger window for editing. Unfortunately I am too new to the program to know where to go for instructions and/or advice. Either a direct answer or direction to the location of appropriate instructions would be appreciated. I apologize for such a sophomoric question. Thank you for your assistance.