How to

#1. First you need to set Gallery Section: Grid to 4 columns. If you can’t set 9, just set 6 columns

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

div.gallery-grid-wrapper {
    grid-template-columns: repeat(4,minmax(0,1fr)) !important;
    grid-template-rows: repeat(36,minmax(0,0.2fr)) !important;
}
.gallery-grid-item-wrapper {
    padding-bottom: 0 !important;
    height: 100%;
}
.gallery-grid-item img {
    position: static;
}
figure.gallery-grid-item:nth-child(5n+1)  {
    grid-column: ~"1 / 3" !important;       
} 
figure.gallery-grid-item:nth-child(5n+2)  {
    grid-column: ~"3 / 5" !important;       
} 
figure.gallery-grid-item:nth-child(5n+4)  {
    grid-column: ~"2 / 5" !important;       
} 
figure.gallery-grid-item:nth-child(5n)  {
    grid-column: ~"1 / 5" !important;       
}

Extra

Apply code for specific page

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

<style>
div.gallery-grid-wrapper {
    grid-template-columns: repeat(4,minmax(0,1fr)) !important;
    grid-template-rows: repeat(36,minmax(0,0.2fr)) !important;
}
.gallery-grid-item-wrapper {
    padding-bottom: 0 !important;
    height: 100%;
}
.gallery-grid-item img {
    position: static;
}
figure.gallery-grid-item:nth-child(5n+1)  {
    grid-column: 1 / 3 !important;       
} 
figure.gallery-grid-item:nth-child(5n+2)  {
    grid-column: 3 / 5 !important;       
} 
figure.gallery-grid-item:nth-child(5n+4)  {
    grid-column: 2 / 5 !important;       
} 
figure.gallery-grid-item:nth-child(5n)  {
    grid-column: 1 / 5 !important;       
} 
</style>

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