We already told that that file is in the Corporate Plus Pro theme, not on Corporate Plus.
You can’t have all the files access from the editor. Either you can get that file from the Cpanel or FTP. Connect your site with FTP details and find that file or login to you site cpanel, go to public_html > wp-content > themes > corporate-plus-pro>acmethemes>customizer\customizer-core.php and check line 500.
Hope this will solve your issues.