How to

#1. First you need to set Gallery Section: Grid to 3 columns

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

figure.gallery-grid-item:nth-child(4n-3) {
    grid-column: ~"1 / 4" !important;       
} 
div.gallery-grid-wrapper {
   grid-template-columns: repeat(3,minmax(0,1fr)) !important;
    grid-template-rows: repeat(10,minmax(0,0.3fr)) !important;
}
.gallery-grid-item-wrapper {
    padding-bottom: 0 !important; 
    height: 100%;
}
.gallery-grid-item img {
    position: static !important;
}

Extra

Apply code for specific page

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

<style>
figure.gallery-grid-item:nth-child(4n-3) {
    grid-column: 1 / 4 !important;       
} 
div.gallery-grid-wrapper {
   grid-template-columns: repeat(3,minmax(0,1fr)) !important;
    grid-template-rows: repeat(10,minmax(0,0.3fr)) !important;
}
.gallery-grid-item-wrapper {
    padding-bottom: 0 !important; 
    height: 100%;
}
.gallery-grid-item img {
    position: static !important;
}
</style>

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