How to

#1. First you need to set Grid – Simple (or Grid – Overlay) to 2 columns

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

div#gridThumbs {
    grid-template-columns: repeat(2,minmax(0,1fr));
    grid-template-rows: repeat(60,minmax(0,0.2fr)) !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(3)  {
    grid-column: ~"1 / 3"  !important;    
      grid-row: ~"2 / 4" !important;  
} 
a.grid-item:nth-child(5)  {
    grid-column: ~"2 / 3"  !important;     
      grid-row: ~"4 / 6" !important;  
} 
a.grid-item:nth-child(7)  {
    grid-column: ~"1 / 3"  !important;     
     grid-row: ~"6 / 8" !important;  
} 
a.grid-item:nth-child(10)  {
    grid-column: ~"1 / 3"  !important;    
      grid-row: ~"9 / 11" !important;  
} 
a.grid-item:nth-child(12)  {
    grid-column: ~"2 / 3"  !important;     
      grid-row: ~"11 / 13" !important;  
} 
a.grid-item:nth-child(14)  {
    grid-column: ~"1 / 3"  !important;     
     grid-row: ~"13 / 15" !important;  
} 
a.grid-item:nth-child(17)  {
    grid-column: ~"1 / 3"  !important;    
      grid-row: ~"16 / 18" !important;  
} 
a.grid-item:nth-child(19)  {
    grid-column: ~"2 / 3"  !important;     
      grid-row: ~"18 / 20" !important;  
} 
a.grid-item:nth-child(21)  {
    grid-column: ~"1 / 3"  !important;     
     grid-row: ~"20 / 22" !important;  
} 
a.grid-item:nth-child(24)  {
    grid-column: ~"1 / 3"  !important;    
      grid-row: ~"23 / 25" !important;  
} 
a.grid-item:nth-child(26)  {
    grid-column: ~"2 / 3"  !important;     
      grid-row: ~"25 / 27" !important;  
} 
a.grid-item:nth-child(28)  {
    grid-column: ~"1 / 3"  !important;     
     grid-row: ~"27 / 29" !important;  
} 
a.grid-item:nth-child(31)  {
    grid-column: ~"1 / 3"  !important;    
      grid-row: ~"30 / 32" !important;  
} 
a.grid-item:nth-child(33)  {
    grid-column: ~"2 / 3"  !important;     
      grid-row: ~"32 / 34" !important;  
} 
a.grid-item:nth-child(35)  {
    grid-column: ~"1 / 3"  !important;     
     grid-row: ~"34 / 36" !important;  
} 
a.grid-item:nth-child(38)  {
    grid-column: ~"1 / 3"  !important;    
      grid-row: ~"37 / 39" !important;  
} 
a.grid-item:nth-child(40)  {
    grid-column: ~"2 / 3"  !important;     
      grid-row: ~"39 / 41" !important;  
} 
a.grid-item:nth-child(42)  {
    grid-column: ~"1 / 3"  !important;     
     grid-row: ~"41 / 43" !important;  
} 
a.grid-item:nth-child(45)  {
    grid-column: ~"1 / 3"  !important;    
      grid-row: ~"44 / 46" !important;  
} 
a.grid-item:nth-child(47)  {
    grid-column: ~"2 / 3"  !important;     
      grid-row: ~"46 / 48" !important;  
} 
a.grid-item:nth-child(49)  {
    grid-column: ~"1 / 3"  !important;     
     grid-row: ~"48 / 50" !important;  
} 
a.grid-item:nth-child(52)  {
    grid-column: ~"1 / 3"  !important;    
      grid-row: ~"51 / 53" !important;  
} 
a.grid-item:nth-child(54)  {
    grid-column: ~"2 / 3"  !important;     
      grid-row: ~"53 / 55" !important;  
} 
a.grid-item:nth-child(56)  {
    grid-column: ~"1 / 3"  !important;     
     grid-row: ~"55 / 57" !important;  
} 
a.grid-item:nth-child(59)  {
    grid-column: ~"1 / 3"  !important;     
     grid-row: ~"58 / 60" !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(2,minmax(0,1fr));
    grid-template-rows: repeat(60,minmax(0,0.2fr)) !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(3)  {
    grid-column: 1 / 3  !important;    
      grid-row: 2 / 4 !important;  
} 
a.grid-item:nth-child(5)  {
    grid-column: 2 / 3  !important;     
      grid-row: 4 / 6 !important;  
} 
a.grid-item:nth-child(7)  {
    grid-column: 1 / 3  !important;     
     grid-row: 6 / 8 !important;  
} 
a.grid-item:nth-child(10)  {
    grid-column: 1 / 3  !important;    
      grid-row: 9 / 11 !important;  
} 
a.grid-item:nth-child(12)  {
    grid-column: 2 / 3  !important;     
      grid-row: 11 / 13 !important;  
} 
a.grid-item:nth-child(14)  {
    grid-column: 1 / 3  !important;     
     grid-row: 13 / 15 !important;  
} 
a.grid-item:nth-child(17)  {
    grid-column: 1 / 3  !important;    
      grid-row: 16 / 18 !important;  
} 
a.grid-item:nth-child(19)  {
    grid-column: 2 / 3  !important;     
      grid-row: 18 / 20 !important;  
} 
a.grid-item:nth-child(21)  {
    grid-column: 1 / 3  !important;     
     grid-row: 20 / 22 !important;  
} 
a.grid-item:nth-child(24)  {
    grid-column: 1 / 3  !important;    
      grid-row: 23 / 25 !important;  
} 
a.grid-item:nth-child(26)  {
    grid-column: 2 / 3  !important;     
      grid-row: 25 / 27 !important;  
} 
a.grid-item:nth-child(28)  {
    grid-column: 1 / 3  !important;     
     grid-row: 27 / 29 !important;  
} 
a.grid-item:nth-child(31)  {
    grid-column: 1 / 3  !important;    
      grid-row: 30 / 32 !important;  
} 
a.grid-item:nth-child(33)  {
    grid-column: 2 / 3  !important;     
      grid-row: 32 / 34 !important;  
} 
a.grid-item:nth-child(35)  {
    grid-column: 1 / 3  !important;     
     grid-row: 34 / 36 !important;  
} 
a.grid-item:nth-child(38)  {
    grid-column: 1 / 3  !important;    
      grid-row: 37 / 39 !important;  
} 
a.grid-item:nth-child(40)  {
    grid-column: 2 / 3  !important;     
      grid-row: 39 / 41 !important;  
} 
a.grid-item:nth-child(42)  {
    grid-column: 1 / 3  !important;     
     grid-row: 41 / 43 !important;  
} 
a.grid-item:nth-child(45)  {
    grid-column: 1 / 3  !important;    
      grid-row: 44 / 46 !important;  
} 
a.grid-item:nth-child(47)  {
    grid-column: 2 / 3  !important;     
      grid-row: 46 / 48 !important;  
} 
a.grid-item:nth-child(49)  {
    grid-column: 1 / 3  !important;     
     grid-row: 48 / 50 !important;  
} 
a.grid-item:nth-child(52)  {
    grid-column: 1 / 3  !important;    
      grid-row: 51 / 53 !important;  
} 
a.grid-item:nth-child(54)  {
    grid-column: 2 / 3  !important;     
      grid-row: 53 / 55 !important;  
} 
a.grid-item:nth-child(56)  {
    grid-column: 1 / 3  !important;     
     grid-row: 55 / 57 !important;  
} 
a.grid-item:nth-child(59)  {
    grid-column: 1 / 3  !important;     
     grid-row: 58 / 60 !important;  
} 
</style>

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