In default, you will see portfolio-galleries as your single portfolio item slug. Unfortunately, At the moment, AZ doesn’t have the option to change it via admin panel.
the only way to do it is by changing it from the php file. yes, you will need to do some code works. here’s how to do it.
find and open this file : post-types.php ( On : wp-content\themes\az\includes\admin\functions )
go to line #33 and just rename portfolio-galleries with the desired name.
'rewrite' => array('slug' => 'portfolio-galleries'),
Don’t forget to flush your permalink after you do this.