WP File Manager

Name	Action
..
block.json	Edit
editor-rtl.css	Edit
editor-rtl.min.css	Edit
editor.css	Edit
editor.min.css	Edit
style-rtl.css	Edit
style-rtl.min.css	Edit
style.css	Edit
style.min.css	Edit

Editing: block.json

{ "$schema": "https://schemas.wp.org/trunk/block.json", "apiVersion": 3, "name": "core/spacer", "title": "Spacer", "category": "design", "description": "Add white space between blocks and customize its height.", "textdomain": "default", "attributes": { "height": { "type": "string", "default": "100px" }, "width": { "type": "string" } }, "usesContext": [ "orientation" ], "supports": { "anchor": true, "spacing": { "margin": [ "top", "bottom" ], "__experimentalDefaultControls": { "margin": true } }, "interactivity": { "clientNavigation": true } }, "editorStyle": "wp-block-spacer-editor", "style": "wp-block-spacer" }