Hide Titles, Captions, Keywords in the new Lightbox

Add a CSS content block to the ENTIRE SITE section of your site and then add this code to it:

/*Hide Titles, Captions and Keywords in the new Lightbox*/
.sm-image-metadata-caption,  .sm-image-metadata-keywords, .sm-image-metadata [data-elem-id=imagemetadata_title_text]{
  display: none !important;
}