Hello,

Try to add the following code in Theme Settings < Custom CSS > Global Custom CSS:

.product-grid-item h3.wd-entities-title {
    display: -webkit-box;
    -webkit-line-clamp: 1; /* Number of lines to show */
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

Best Regards.