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Collapse the Admin Menu by Default

Starts everyone with the narrow, icon-only admin menu for more working space. Users who expand it keep their choice.

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Code

add_filter( 'admin_body_class', function ( $classes ) {
    // "mfold" is the saved collapse setting; it is empty until the user toggles the menu.
    if ( '' === (string) get_user_setting( 'mfold', '' ) && false === strpos( $classes, 'folded' ) ) {
        $classes .= ' folded';
    }

    return $classes;
} );

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