WP File Manager

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

Editing: block.json

{ "$schema": "https://schemas.wp.org/trunk/block.json", "apiVersion": 3, "name": "core/nextpage", "title": "Page Break", "category": "design", "description": "Separate your content into a multi-page experience.", "keywords": [ "next page", "pagination" ], "parent": [ "core/post-content" ], "textdomain": "default", "supports": { "customClassName": false, "className": false, "html": false, "interactivity": { "clientNavigation": true } }, "editorStyle": "wp-block-nextpage-editor" }