Hi there,
Welcome to SeaTheme forum.

1.It is possible by custom CSS(“Appearance > Customize: Additional CSS”), like:

@media (min-width: 768px) { /*for desktop, default is 160px*/
 .gallery-post-des {
    margin-bottom: 120px;
 }
}
@media (max-width: 767px){
.responsive-ux .gallery-post-des { /*for mobile, default is 60px*/
    margin-bottom: 40px;
 }
}

2. Please edit the homepage, set 1 for the selector “Columns for Mobile”

3. Please enable “Switch to Page Builder”, click Choose Module to choose a Text or other module to build the section. It will show under the portfolio.

Regards! SeaTheme – FAQs – Twitter – Facebook