To add a red dot after title in Summary Block Sold Out Product like this.
You can use this code to Custom CSS box.
If code doesn’t work, you can comment below, message or email me.
div.summary-item:has(.product-mark.sold-out) .summary-title-link:after {
content: "";
background-color: #bb261a;
width: 7px;
height: 7px;
border-radius: 50%;
display: inline-block;
margin: 0px 0px 2px 7px;
}