Cannot enable Gutenberg editor [closed]

The block editor (formerly known as Gutenberg) is the default editor. You should not need to install the plugin or choose an option to make it the default.

The plugin is now just for following and testing future developments, and the Settings > Writing option only appears if you’re using the Classic Editor plugin.

The only reasons I can think of that it wouldn’t already be the default editor are:

• The Classic Editor plugin, or similar, is activated and enabled.
• You’re using a page builder plugin — or a theme with a bundled page builder — that disables or bypasses the block editor.
• You are editing a custom post type that does not support the REST API (show_in_rest needs to be true).
• Your host is forcing it to be disabled. Check for a wp-content/mu-plugins directory and see if it contains a file that sounds like it would do this.
• You have otherwise added code, via plugin or theme, that disables it. Try disabling your plugins one by one until the proper editor appears.
• You’re not actually running 5.0.3. Check the bottom right corner of the admin. It should say “Version 5.0.3”.