Hi Stephane,
Thank you for reaching out, and I am sorry for the inconvenience.
Currently, there isn’t an input option for setting the height and width of the image in the modal selector. However, you can achieve this by using custom CSS, as shown in the screenshot: https://prnt.sc/GTMkyURT1leO
#addonId .sppb-magnific-popup img{
width: 100px;
}
You can also customize the height and add media queries within the CSS for better responsiveness.
Please let me know if you need further assistance.
Best regards