IN this answer, we have share How to change page title in admin area in WordPress. You could also do a str_replace on $admin_title to remove “— WordPress” and change “‹”. Look at the top of the
wp-admin/admin-header.php file to see what is going on by default.
add_filter('admin_title', 'my_admin_title', 10, 2);
function my_admin_title($admin_title, $title)
return get_bloginfo('name').' • '.$title;
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