Reply To: Change size of slider section on main page

Hello ray0787,
Thank so much for using our theme mercantile. Please add the below css codes on Appearance > Customize > Additional CSS. Hope the below CSS codes help to sort out the problem.

.owl-wrapper-outer, 
.image-slider-wrapper .owl-item,
image-slider-wrapper{
	height : 60vh !important;
}

Regards