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(10,minmax(0,1fr)) !important;
  }
  .gallery-grid-item-wrapper {
      padding-bottom: 0 !important; 
      height: 100%;
  }
  .gallery-grid-item img {
      position: static !important;
 }
 figure.gallery-grid-item:nth-child(1)  {
     grid-column: ~"1 / 3" !important;     
      grid-row: ~"1 / 3" !important;     
 } 
 figure.gallery-grid-item:nth-child(6)  {
     grid-column: ~"1 / 3" !important;     
      grid-row: ~"3 / 5" !important;     
 } 
 figure.gallery-grid-item:nth-child(11)  {
     grid-column: ~"1 / 3" !important;     
      grid-row: ~"5 / 7" !important;     
 } 
 figure.gallery-grid-item:nth-child(16)  {
     grid-column: ~"1 / 3" !important;     
      grid-row: ~"7 / 9" !important;     
 } 
 figure.gallery-grid-item:nth-child(21)  {
     grid-column: ~"1 / 3" !important;     
      grid-row: ~"9 / 11" !important;     
 } 
 figure.gallery-grid-item:nth-child(26)  {
     grid-column: ~"1 / 3" !important;     
      grid-row: ~"11 / 13" !important;     
 } 
 figure.gallery-grid-item:nth-child(31)  {
     grid-column: ~"1 / 3" !important;     
      grid-row: ~"13 / 15" !important;     
 } 
 figure.gallery-grid-item:nth-child(36)  {
     grid-column: ~"1 / 3" !important;     
      grid-row: ~"15 / 17" !important;     
 } 
 figure.gallery-grid-item:nth-child(41)  {
     grid-column: ~"1 / 3" !important;     
      grid-row: ~"17 / 19" !important;     
 } 
 figure.gallery-grid-item:nth-child(46)  {
     grid-column: ~"1 / 3" !important;     
      grid-row: ~"19 / 21" !important;     
 } 
 figure.gallery-grid-item:nth-child(51)  {
     grid-column: ~"1 / 3" !important;     
      grid-row: ~"21 / 23" !important;     
 } 
 figure.gallery-grid-item:nth-child(56)  {
     grid-column: ~"1 / 3" !important;     
      grid-row: ~"23 / 25" !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(10,minmax(0,1fr)) !important;
  }
  .gallery-grid-item-wrapper {
      padding-bottom: 0 !important; 
      height: 100%;
  }
  .gallery-grid-item img {
      position: static !important;
 }
 figure.gallery-grid-item:nth-child(1)  {
     grid-column: 1 / 3 !important;     
      grid-row: 1 / 3 !important;     
 } 
 figure.gallery-grid-item:nth-child(6)  {
     grid-column: 1 / 3 !important;     
      grid-row: 3 / 5 !important;     
 } 
 figure.gallery-grid-item:nth-child(11)  {
     grid-column: 1 / 3 !important;     
      grid-row: 5 / 7 !important;     
 } 
 figure.gallery-grid-item:nth-child(16)  {
     grid-column: 1 / 3 !important;     
      grid-row: 7 / 9 !important;     
 } 
 figure.gallery-grid-item:nth-child(21)  {
     grid-column: 1 / 3 !important;     
      grid-row: 9 / 11 !important;     
 } 
 figure.gallery-grid-item:nth-child(26)  {
     grid-column: 1 / 3 !important;     
      grid-row: 11 / 13 !important;     
 } 
 figure.gallery-grid-item:nth-child(31)  {
     grid-column: 1 / 3 !important;     
      grid-row: 13 / 15 !important;     
 } 
 figure.gallery-grid-item:nth-child(36)  {
     grid-column: 1 / 3 !important;     
      grid-row: 15 / 17 !important;     
 } 
 figure.gallery-grid-item:nth-child(41)  {
     grid-column: 1 / 3 !important;     
      grid-row: 17 / 19 !important;     
 } 
 figure.gallery-grid-item:nth-child(46)  {
     grid-column: 1 / 3 !important;     
      grid-row: 19 / 21 !important;     
 } 
 figure.gallery-grid-item:nth-child(51)  {
     grid-column: 1 / 3 !important;     
      grid-row: 21 / 23 !important;     
 } 
 figure.gallery-grid-item:nth-child(56)  {
     grid-column: 1 / 3 !important;     
      grid-row: 23 / 25 !important;     
 } 
</style>

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