https://docs.magento.com/m2/ce/user_guide/design/layout-update-place-block.html

Using a Layout Update

Blocks can be placed in the left or right sidebar of a specific page by making a layout update to the XMLcode. With a few simple changes to the code, you can position the block in either sidebar, and control its position in relation to other blocks.

ブロックは、XMLコードに更新することで、特定のページのサイドバーの右でも左でも配置することができます。コードのいくつかの簡単な変更で、他のブロックとの関係での配置をすることができます。

The term callout is sometimes used to refer to a block that is defined as a layout update with XML code. The term sidebar refers to the left or right columns of the page layout. When entering layout update code, make sure to follow the syntax exactly as shown in the example.

To place a block in the sidebar, the page must have a two-or three-column layout. To learn more, see: Page Layout.

To place a block in the sidebar of a page:

1. On the Admin sidebar, tap Content. Then under Elements, choose Blocks.
2. In the grid, find the block you want to place, and take note of its Identifier. Make sure that you have the correct spelling.
3. On the Admin sidebar, tap Content. Then under Elements, choose Pages.
4. Find the page where you want to place the block, and open the page in edit mode.
5. In the panel on the left, choose Design. Then, do the following:
a. In the Layout Update XML box, enter the code for the right or left sidebar.
  • Code for CMS Block in Sidebar
                                        <reference name="right">
    <block type="cms/block" name="right.permanent.callout">
    <action method="setBlockId"><block_id>your-block-id</block_id></action>
    </block>
    </reference>
    
b. Change the reference name to identify either the “right” or “left” column, according to the layout of the page.
c. Change the block_id to the identifier of the block that is being placed.
6. When complete, tap Save Page.