Custom Portfolio 2: 2 small – 1 large – 2 small – 1 large

How to

#1. First you need to set Grid – Simple (or Grid – Overlay) to 2 columns

#2. Next, use this code to Custom CSS box

a.grid-item:nth-child(3n+3) {
    grid-column: ~"1 / 3" !important;
}
div#gridThumbs {
    grid-template-columns: repeat(2,minmax(0,1fr));
}

Extra

Apply code for specific portfolio page

With Business Plan/Higher, use this code to Page Header

<style>
a.grid-item:nth-child(3n+3) {
    grid-column: 1 / 3 !important;
}
div#gridThumbs {
    grid-template-columns: repeat(2,minmax(0,1fr));
}
</style>

With Personal/Basic Plan, use this code to Custom CSS

See how to find Page ID

#enter-page-id {
a.grid-item:nth-child(3n+3) {
    grid-column: 1 / 3 !important;
}
div#gridThumbs {
    grid-template-columns: repeat(2,minmax(0,1fr));
}
}

Apply code for Desktop Only

For All pages, use this code to Custom CSS

@media screen and (min-width:768px) {
a.grid-item:nth-child(3n+3) {
    grid-column: ~"1 / 3" !important;
}
}

For specific portfolio page, use this code to Page Header

<style>
@media screen and (min-width:768px) {
a.grid-item:nth-child(3n+3) {
    grid-column: 1 / 3 !important;
}
}
</style>

For specific portfolio page (Personal Plan), use this code to Custom CSS

@media screen and (min-width:768px) {
#enter-page-id a.grid-item:nth-child(3n+3) {
    grid-column: ~"1 / 3" !important;
}
}

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