How to

#1. First you need to set Grid – Simple (or Grid – Overlay) to 9 columns

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

div#gridThumbs {
    grid-template-columns: repeat(9,minmax(0,1fr));
    grid-template-rows: repeat(10,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;
}
a.grid-item:nth-child(6n - 5)  {
    grid-column: ~"1 / 4" !important;       
} 
a.grid-item:nth-child(6n - 4)  {
    grid-column: ~"4 / 7" !important;       
}  
a.grid-item:nth-child(6n - 3)  {
    grid-column: ~"7 / 10" !important;       
}  
a.grid-item:nth-child(6n - 2)  {
    grid-column: ~"1 / 2" !important;       
}  
a.grid-item:nth-child(6n - 1)  {
    grid-column: ~"2 / 9" !important;       
}  
a.grid-item:nth-child(6n)  {
    grid-column: ~"9 / 10" !important;       
} 

Extra

Apply code for specific portfolio page

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

<style>
div#gridThumbs {
    grid-template-columns: repeat(9,minmax(0,1fr));
    grid-template-rows: repeat(10,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;
}
a.grid-item:nth-child(6n - 5)  {
    grid-column: 1 / 4 !important;       
} 
a.grid-item:nth-child(6n - 4)  {
    grid-column: 4 / 7 !important;       
}  
a.grid-item:nth-child(6n - 3)  {
    grid-column: 7 / 10 !important;       
}  
a.grid-item:nth-child(6n - 2)  {
    grid-column: 1 / 2 !important;       
}  
a.grid-item:nth-child(6n - 1)  {
    grid-column: 2 / 9 !important;       
}  
a.grid-item:nth-child(6n)  {
    grid-column: 9 / 10 !important;       
} 
</style>

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