How to hide a Sidebar from other admins?

Here is the solution I’ve used which is css based.

global $pagenow;
    if (in_array($pagenow, array('widgets.php'))) {

function Only_show_to_webmaster_user_things_by_css() {
    global $current_user;
    $username = $current_user->user_login;
    if ($username == 'Your_Username_Here') {
}
    else {
    ?>
<style>#Sidebar_ID_Here{display:none !important;}</style>
    <?php
    }
}
add_action('admin_head','Only_show_to_webmaster_things_by_css');
}