Please select your Woocommerce Product -> click on individual product settings -> scroll down to background -> set color or image as a background and set your changes.
Hi, If My customer want to hidden the background automatic, how do i? they already upload png but the background still appear, how do i?
unfortunately i don't understand your question. Do you want the background not to be shown at all? In that case please insert the color of the background color of your website.