To view single format thumbnails, you may need to extract the specific format files from the zip file and then open them in the Data 7 Embroidery Design Viewer Tool. As for a "how to use" guide, you could try checking on the program's website or contacting their customer support for assistance. When choosing to save a JEF file, you can save it to any folder of your choice, such as the design source or reading pillows folder. And yes, having all the designs in a single folder can make it easier for a quick view of all designs.