To disable crop features on Gallery Images, you can use this code to Custom CSS.
div.gallery figure img {
object-fit: contain !important;
}
To apply it on a specific Gallery, you can find Gallery ID.
Then use CSS code like this.
section[data-section-id="678b6ec605b99928fd3c506f"] {
div.gallery figure img {
object-fit: contain !important;
}}