The slicer is the program into which you load the model, position it, modify it, etc., then create the file to send to the printer. Once you identify the name of the software, you can type into your search engine 'slicer name' "scale object" to find descriptions of how to adjust size. When you find this information, ensure to check for terms such as proportional or to check that all axes are selected for scale change. If, for example, you selected only the z-axis and changed the size to 20 percent, you'd have a print that is one-fifth original height, but just as wide and deep as the original.