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Hide Template Editing in the Post Editor

Removes the option to switch to and edit the site template from inside the post and page editor, so content editors cannot change the site layout by accident.

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Code

add_filter( 'block_editor_settings_all', function ( $settings, $context ) {
    if ( ! empty( $context->post ) ) {
        $settings['supportsTemplateMode'] = false;
    }

    return $settings;
}, 10, 2 );

Notes

Administrators can still edit templates in the Site Editor.

How to add this snippet

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  2. Use snippet above adds it from the library in one click. Or copy the code into a new snippet with the same code type.
  3. It is added inactive: review the code and settings, then switch it on.

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