Hide photoset count

To remove the photoset counter that shows in the box over posts simply copy and paste the code below in to Custom CSS which is in Advanced Options.

To hide just the numbers.

.post-photoset .photoset-count {
display:none !important;
}

To hide just the numbers and arrows.

.post-photoset .ps-options {
display:none !important;
}

To show on hover only.

.post-photoset .photoset-count {
opacity:0;
}