The image gallery grid slides in from the left. The following CSS disables that.

Add in default preset of the css settings of the modules **Gallery Item.**

animation: none !important;
Code language: HTTP (http)

Or custom css

/* -- START don't slide in gallery -- */
.et_pb_gallery_item {
-webkit-animation: none !important;
-moz-animation: none !important;
-o-animation: none !important;
-ms-animation: none !important;
animation: none !important;
}
/* -- START don't slide in gallery -- */
Code language: CSS (css)