Could not find customization option which was there in present in setting in Dynamics 365 when we click hamburger option on navigation bar

Hi, I want to get Discovery Service Url for MS CRM. I searched and found out that it should be present in the 'customization' field under 'setting' options. But I am unable to find this setting options in the latest Dynamics 365. I am attaching a video which shows how to get discovery service URL in MS Dynamics CRM but it works in old Dynamics.

www.youtube.com/watch