サイドバーのメニューセクションの順序を制御する方法

[chapoi]

The sidebar-wrapper class on mobile is replaced by sidebar-hamburger-dropdown I believe. So adding that should make it work on mobile too:

.sidebar-wrapper, 
.sidebar-hamburger-dropdown { 
  .sidebar-custom-sections {
    display: contents;
  } 
  [data-section-name="community"] {
    order: -4;
  }
  [data-section-name="categories"] {
    order: -3;
  }
  [data-section-name="tags"] {
    order: -2;
  }
  [data-section-name="custom-section-name"] {
    order: -1;
  }
}