How to

#1. First you need to set Grid – Simple (or Grid – Overlay) to 4 columns

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

div#gridThumbs {
    grid-template-columns: repeat(4,minmax(0,1fr));
    grid-template-rows: repeat(35,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(1)  {
    grid-column: ~"1 / 3" !important;  
    grid-row: ~"1 / 3" !important;
} 
a.grid-item:nth-child(6)  {
    grid-column: ~"1 / 4" !important;  
    grid-row: ~"3 / 5" !important;
} 
a.grid-item:nth-child(7)  {
    grid-column: ~"4 / 5" !important;  
    grid-row: ~"3 / 5" !important;
} 
a.grid-item:nth-child(8)  {
    grid-column: ~"1 / 3" !important;  
    grid-row: ~"5 / 7" !important;
} 
a.grid-item:nth-child(13)  {
    grid-column: ~"1 / 4" !important;  
    grid-row: ~"7 / 9" !important;
} 
a.grid-item:nth-child(14)  {
    grid-column: ~"4 / 5" !important;  
    grid-row: ~"7 / 9" !important;
}
a.grid-item:nth-child(15)  {
    grid-column: ~"1 / 3" !important;  
    grid-row: ~"9 / 11" !important;
} 
a.grid-item:nth-child(20)  {
    grid-column: ~"1 / 4" !important;  
    grid-row: ~"11 / 13" !important;
} 
a.grid-item:nth-child(21)  {
    grid-column: ~"4 / 5" !important;  
    grid-row: ~"11 / 13" !important;
} 
a.grid-item:nth-child(22)  {
    grid-column: ~"1 / 3" !important;  
    grid-row: ~"13 / 15" !important;
} 
a.grid-item:nth-child(27)  {
    grid-column: ~"1 / 4" !important;  
    grid-row: ~"15 / 17" !important;
} 
a.grid-item:nth-child(28)  {
    grid-column: ~"4 / 5" !important;  
    grid-row: ~"15 / 17" !important;
}
a.grid-item:nth-child(29)  {
    grid-column: ~"1 / 3" !important;  
    grid-row: ~"17 / 19" !important;
} 
a.grid-item:nth-child(34)  {
    grid-column: ~"1 / 4" !important;  
    grid-row: ~"19 / 21" !important;
} 
a.grid-item:nth-child(35)  {
    grid-column: ~"4 / 5" !important;  
    grid-row: ~"19 / 21" !important;
} 
a.grid-item:nth-child(36)  {
    grid-column: ~"1 / 3" !important;  
    grid-row: ~"21 / 23" !important;
} 
a.grid-item:nth-child(41)  {
    grid-column: ~"1 / 4" !important;  
    grid-row: ~"23 / 25" !important;
} 
a.grid-item:nth-child(42)  {
    grid-column: ~"4 / 5" !important;  
    grid-row: ~"23 / 25" !important;
}
a.grid-item:nth-child(43)  {
    grid-column: ~"1 / 3" !important;  
    grid-row: ~"25 / 27" !important;
} 
a.grid-item:nth-child(48)  {
    grid-column: ~"1 / 4" !important;  
    grid-row: ~"27 / 29" !important;
} 
a.grid-item:nth-child(49)  {
    grid-column: ~"4 / 5" !important;  
    grid-row: ~"27 / 29" !important;
} 
a.grid-item:nth-child(50)  {
    grid-column: ~"1 / 3" !important;  
    grid-row: ~"29 / 31" !important;
} 
a.grid-item:nth-child(55)  {
    grid-column: ~"1 / 4" !important;  
    grid-row: ~"31 / 33" !important;
} 
a.grid-item:nth-child(56)  {
    grid-column: ~"4 / 5" !important;  
    grid-row: ~"31 / 33" !important;
}
a.grid-item:nth-child(57)  {
    grid-column: ~"1 / 3" !important;  
    grid-row: ~"33 / 35" !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(4,minmax(0,1fr));
    grid-template-rows: repeat(35,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(1)  {
    grid-column: 1 / 3 !important;  
    grid-row: 1 / 3 !important;
} 
a.grid-item:nth-child(6)  {
    grid-column: 1 / 4 !important;  
    grid-row: 3 / 5 !important;
} 
a.grid-item:nth-child(7)  {
    grid-column: 4 / 5 !important;  
    grid-row: 3 / 5 !important;
} 
a.grid-item:nth-child(8)  {
    grid-column: 1 / 3 !important;  
    grid-row: 5 / 7 !important;
} 
a.grid-item:nth-child(13)  {
    grid-column: 1 / 4 !important;  
    grid-row: 7 / 9 !important;
} 
a.grid-item:nth-child(14)  {
    grid-column: 4 / 5 !important;  
    grid-row: 7 / 9 !important;
}
a.grid-item:nth-child(15)  {
    grid-column: 1 / 3 !important;  
    grid-row: 9 / 11 !important;
} 
a.grid-item:nth-child(20)  {
    grid-column: 1 / 4 !important;  
    grid-row: 11 / 13 !important;
} 
a.grid-item:nth-child(21)  {
    grid-column: 4 / 5 !important;  
    grid-row: 11 / 13 !important;
} 
a.grid-item:nth-child(22)  {
    grid-column: 1 / 3 !important;  
    grid-row: 13 / 15 !important;
} 
a.grid-item:nth-child(27)  {
    grid-column: 1 / 4 !important;  
    grid-row: 15 / 17 !important;
} 
a.grid-item:nth-child(28)  {
    grid-column: 4 / 5 !important;  
    grid-row: 15 / 17 !important;
}
a.grid-item:nth-child(29)  {
    grid-column: 1 / 3 !important;  
    grid-row: 17 / 19 !important;
} 
a.grid-item:nth-child(34)  {
    grid-column: 1 / 4 !important;  
    grid-row: 19 / 21 !important;
} 
a.grid-item:nth-child(35)  {
    grid-column: 4 / 5 !important;  
    grid-row: 19 / 21 !important;
} 
a.grid-item:nth-child(36)  {
    grid-column: 1 / 3 !important;  
    grid-row: 21 / 23 !important;
} 
a.grid-item:nth-child(41)  {
    grid-column: 1 / 4 !important;  
    grid-row: 23 / 25 !important;
} 
a.grid-item:nth-child(42)  {
    grid-column: 4 / 5 !important;  
    grid-row: 23 / 25 !important;
}
a.grid-item:nth-child(43)  {
    grid-column: 1 / 3 !important;  
    grid-row: 25 / 27 !important;
} 
a.grid-item:nth-child(48)  {
    grid-column: 1 / 4 !important;  
    grid-row: 27 / 29 !important;
} 
a.grid-item:nth-child(49)  {
    grid-column: 4 / 5 !important;  
    grid-row: 27 / 29 !important;
} 
a.grid-item:nth-child(50)  {
    grid-column: 1 / 3 !important;  
    grid-row: 29 / 31 !important;
} 
a.grid-item:nth-child(55)  {
    grid-column: 1 / 4 !important;  
    grid-row: 31 / 33 !important;
} 
a.grid-item:nth-child(56)  {
    grid-column: 4 / 5 !important;  
    grid-row: 31 / 33 !important;
}
a.grid-item:nth-child(57)  {
    grid-column: 1 / 3 !important;  
    grid-row: 33 / 35 !important;
} 
</style>

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