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Stop Non-Administrators Changing Content Widths

Hides the content width and wide width fields in the layout settings of Group and similar blocks for everyone except administrators, so page widths stay consistent.

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Code

add_filter( 'wp_theme_json_data_theme', function ( $theme_json ) {
    if ( current_user_can( 'manage_options' ) ) {
        return $theme_json;
    }

    return $theme_json->update_with( array(
        'version'  => WP_Theme_JSON::LATEST_SCHEMA,
        'settings' => array(
            'layout' => array( 'allowCustomContentAndWideSize' => false ),
        ),
    ) );
} );

Notes

Needs WordPress 6.6+; older versions ignore the setting.

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  3. It is added inactive: review the code and settings, then switch it on.

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