Hi,

There is not the feature, you need to add it manually by 2 steps:

1. Please go to Appearance>Theme Editor, edit a theme php file: template/single/gallery/portfolio-slider.php , follow the screenshot: https://www.dropbox.com/s/73jmd27k2pedfna/qq20210419-090730.jpg?dl=0
(better place it into a child theme, or it will be recover when you update theme, refer to how to use child theme)

2. Please paste the custom CSS code to “Appearance > Customize: Additional CSS”

.single-portfolio-fullwidth-slider .owl-dots {
   display: none;
 }
@media (max-width: 768px){
.single-portfolio-fullwidth-slider .owl-carousel button.owl-dot {
    background-color: #333;
}
.single-portfolio-fullwidth-slider .owl-dots { 
    margin-top: -20px; display: block;
 }
}

Regards!
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