Currently testing with WP 6.7 RC1 and PHP 8.3!
MRW Simplified Editor
Learn how to customize the Gutenberg block editor to display only the necessary options and blocks, enhancing its simplicity and cleanliness for a more streamlined editing experience.
Extract from WordPress.org
Help your site’s editors create semantic content and style it with the theme for consistent formatting and portable content. This plugin removes blocks and other styling options to help editors focus.
https://wordpress.org/plugins/mrw-web-design-simple-tinymce/