This setting is not visible on individual sites in a Multisite Network. Instead this setting is set at a Network level on the Network Admin Settings Screen.
If you need to control this setting per-site, see this previous question on the topic.
This setting is not visible on individual sites in a Multisite Network. Instead this setting is set at a Network level on the Network Admin Settings Screen.
If you need to control this setting per-site, see this previous question on the topic.