Grid Row Gutter Variations The space between each row, known as a rowigutter or row_gutter, is configurable with the variable of the same name. The default value is medium.
Important Notes:

All accepted values for row-gutter can be seen in the Schema tab at the top of this page.
Demo

None Row Gutter

Span 12 columns
Span 12 columns
Span 12 columns

Medium Row Gutter

Span 12 columns
Span 12 columns
Span 12 columns
Twig
{% include '@bolt-layouts-grid/grid.twig' with {
  row_gutter: 'large',
  ...
} only %}
HTML
<bolt-grid row-gutter="large">
  <!-- Grid Items -->
</bolt-grid>