Hello,
Add the next code in Theme options > Theme custom CSS:
.content-product .st-swatch-popup>.et_st-default-holder ul.st-swatch-size-normal li {
width: 24px !important;
height: 24px !important;
}
.et_st-default-holder {
margin-bottom: 10px;
}
.content-product .st-swatch-popup>.et_st-default-holder ul.st-swatch-size-normal li >span {
padding: 6px !important;
font-size: 11px !important;
}
you can select the Image type – https://prnt.sc/-l3cdgWZEecc
Regards