There are a few plugins to disable Gutenberg Editor. Suppose you can use this plugin. WordPress also provides an official plugin to disable Gutenberg and continue with Classic Editor. You can try out this plugin
Ideally access controls would be implemented via WordPress’s Roles and Capabilities system. But in highly-granular cases such as limiting access to a single post to a few users, the map_meta_cap filter can be used to shim in additional restrictions. In this case, when WordPress is testing an edit_post capability for a user/post combination, we can … Read more
How to fix the Post Preview Button (CPT & map_meta_cap)
Remove the preview link box since 6.0 update
Implement editor’ CSS on the custom themes
You will have to worry about formats beeing over written. Ex. <p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. ____Stet clita kasd gubergren, no sea takimata sanctus … Read more
If you’ve written it as it actually appears, you are missing the semi-colon ; directly following the >. Sometimes moving between the visual editor and the html editor will cause this problem. It can also happen when copying and pasting code from another source. Go into the HTML editor and check the code where the … Read more
I know this isn’t exactly the fix you’re looking for, but you could try simply adjusting the default size of the editor in WordPress’s settings. You can go to Settings –> Writing and change the value under “Size of the post box” to make it larger or smaller. I have mine set to 30 lines … Read more
Your best bet is to create a new “physical page” and save it in your theme root folder as a template called something suchlike tpl_aufwind.php like this: <?php /* * Template Name: Aufwind * * */ ?> you will need that code above at the very top of the tpl_aufwind.php so that it shows up … Read more
There is no built-in mechanism to access php in the post editor. The best solution would be to create a custom shortcode which you can use to access the variable. This is probably the safest and most secure method available.