editor

Ah … Got it. It’s not related to Gutenberg editor but WordPress core itself: window.wp.editor is being initiated here with those methods: https://github.com/WordPress/wordpress-develop/blob/9ed92faaca92f66ec9e2979c9d896ddab3e4e993/src/js/_enqueues/wp/editor/base.js And then, window.wp.oldEditor = window.wp.editor: https://github.com/WordPress/wordpress-develop/blob/5868743f1f2b05c93642c9eebf89cb7f6610d6df/src/wp-includes/script-loader.php#L369

Before WP 5.9 it was possible to get rid of some heading types with CSS like this: .block-library-heading-level-toolbar .components-toolbar-group { button:nth-child(1), button:nth-child(5), button:nth-child(6) { display: none; } } Since WP 5.9 the HTML code has changed. Now you can hide H1, H5 and H6 like this: [aria-label=”Heading 1″], [aria-label=”Heading 5″], [aria-label=”Heading 6″] { display: none; … Read more