Give me some more particulars on your desires of how you wish to display your graphics. Several ways of accomplishing this, you can control the size of your graphic - if your display settings are say 500 x 500 and you upload pic of 350 x 350 it will not zoom. Or You can use a shot that shows the whole product, and it will display intact - but the zoom will allow for closer detail.
You can remove or disable the zoom feature in the coding of the template.
Or are you trying to have the graphic go to full page - either within the product page or as a pop up box? This is an extension in the marketplace that may provide a solution for you.
marketplace.abantecart.com/lightbox_html5Too many ways, without knowing what you would like to do, and perhaps what your skill level is in the coding area.
Lee