How to

#1. First you need to set Grid – Simple (or Grid – Overlay) to 3 columns

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

a.grid-item:nth-child(4n - 3) {
    grid-column: ~"1 / 3" !important;
}

a.grid-item:nth-child(4n) {
      grid-column: ~"2 / 4" !important;
}
div#gridThumbs {
    grid-template-columns: repeat(3,minmax(0,1fr));
    grid-template-rows: repeat(30,minmax(0,0.5fr)) !important;
}
.portfolio-grid-overlay .grid-item {
    padding-bottom: 0 !important;
    height: 100%;
}
.portfolio-grid-overlay .grid-item .grid-image {
    position: static;
}

Extra

Apply code for specific portfolio page

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

<style>
a.grid-item:nth-child(4n - 3) {
    grid-column: 1 / 3 !important;
}

a.grid-item:nth-child(4n) {
      grid-column: 2 / 4 !important;
}
div#gridThumbs {
    grid-template-columns: repeat(3,minmax(0,1fr));
    grid-template-rows: repeat(30,minmax(0,0.5fr)) !important;
}
.portfolio-grid-overlay .grid-item {
    padding-bottom: 0 !important;
    height: 100%;
}
.portfolio-grid-overlay .grid-item .grid-image {
    position: static;
}
</style>

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