How to Make admin Sidebar Menu always be Collapse by code

To make the admin sidebar menu always be collapsed, try adding the following code in the functions.php file of your child theme, or add it in your site using a plugin like Code Snippets, or Add Actions and Filters.

global $user_ID;
$user_fold = get_user_meta( $user_ID, 'wp_user-settings', true );
$exp_array = explode( "&", $user_fold );
$search_array = array_search( "mfold=o", $exp_array );
if ( $search_array ) {
    $exp_array[ $search_array ] = "mfold=f";
    $exp_array = implode( "&", $exp_array );
    update_user_meta( $user_ID, 'wp_user-settings', $exp_array );
}

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