To keep Gallery Grid 5 columns on Mobile, you can follow these.
#1. Use Squarespace ID Finder to find Gallery Grid Section ID. In my example, it is:
- section[data-section-id=”66963fd8a98fdd484815c01a”]
#2. Use this code to Custom CSS box
@media screen and (max-width:991px) {
section[data-section-id="66963fd8a98fdd484815c01a"] .gallery-grid-wrapper {
grid-template-columns: repeat(5,1fr) !important;
}}