Disable Image change on Store Page

#1. First, you access Custom CSS box

#2. Enter the code like below and click Save

img.grid-item-image.grid-image-cover {
    opacity: 1 !important;
}
img.grid-item-image.grid-item-additional-image {
    opacity: 0 !important;
}
img.grid-item-image.grid-image-hover {
    opacity: 0 !important;
}