Hi, Please use the CSS(“Appearance > Customize : Additional CSS”) to change spacing:

You can change the value, the spacing will change.

@media (min-width: 768px) {
/*the padding top of title(the default is 120)*/
.single-portfolio-fullwidth-slider .gallery-post-des, .single-portfolio-fullscreen-slider .gallery-post-des, .single-portfolio-fullwidth .gallery-post-des {
    padding-top: 120px; }
}
/*the spacing bottom of title */
.single-portfolio-fullwidth .gallery-post-des {
    margin-bottom: 120px;
}
body.single .entry {
  margin-bottom: 80px;
}
/*the spacing bottom of gallery */
.gallery-link {
   margin-bottom: 80px;  margin-top: 80px;
}

Regards!