Layout Full Bleed It's possible to have "top-level" layout with no outer spaces.
Important Notes: Any bolt-layout that is not directly contained within another bolt-layout is considered a "top-level". If it is "top-level" then it has outer sapces on the top, bottom, left and right. Any bolt-layout that is directly placed inside another bolt-layout is considered a "nested" then it occupies all available width without outer spaces.Use full_bleed set to true if there's a desire of having "top-level" bolt-layout looks like nested - occupy all available width without outer spaces.Don't use full_bleed option on nested bolt-layouts since they occupy all available space by default.
Demo

This below is top-level bolt-layout with the full_bleed prop set to true. For this reason it hasn't got outer spaces, same as in nested bolt-layouts.

Alt text.

This is nested bolt-layout. Nested bolt-layouts have no paddings around by default. Lorem ipsum dolor sit, amet consectetur adipisicing elit. Distinctio consequuntur ipsam consectetur at, quod optio! Neque quo eligendi itaque enim non fugiat odit suscipit qui voluptatum accusantium provident, quis voluptates.

Alt text.
Twig
{% set nested_layout %}
  {% set layout_items %}
    {% include '@bolt-layouts-layout/layout-item.twig' with {
      content: 'content'
    } only %}
    {% include '@bolt-layouts-layout/layout-item.twig' with {
      content: 'content'
    } only %}
  {% endset %}
  {% include '@bolt-layouts-layout/layout.twig' with {
    content: layout_items,
    template: [
      '25/75@from-small'
    ],
  } only %}
{% endset %}
{% include '@bolt-layouts-layout/layout.twig' with {
  content: nested_layout,
  template: [
    'halves@from-small',
  ],
  full_bleed: true,
} only %}
HTML
<!-- Add prop to make top level layout behave like was nested -->
<bolt-layout template="halves@from-small" full-bleed>
  <bolt-layout-item>
    <!-- Add prop to make nested layout behave like was top level -->
    <bolt-layout template="25/75@from-small">
      <bolt-layout-item>
        <!-- Content goes here -->
      </bolt-layout-item>
      <bolt-layout-item>
        <!-- Content goes here -->
      </bolt-layout-item>
    </bolt-alyout>
  </bolt-layout-item>
  <bolt-layout-item>
    <!-- Content goes here -->
  </bolt-layout-item>
</bolt-layout>