Hi smart.sharukhkhan786,

Thanks for reaching to us.

1. Sorry to say but right now there is no option in Theme Settings available for gallery height in the mobile. You can create a ticket here: https://woodmart.canny.io/feature-requests so our developers will consider such a feature.

2. Active border

Please add below Custom CSS code to Theme Settings > Custom CSS > Global custom CSS:

.wd-gallery-thumb .wd-thumb-active img{
	border: 1px solid #000;
}

Regards,