How to stop real-time changes polling in issues and merge-requests pages?

We couldn’t find the “Application settings -> Real-time features” setting mentioned in https://docs.gitlab.com/ce/administration/polling.html

We’d like to stop, or decrease the polling interval, it’s way too frequent, thanks!

The setting is available under the Admin Area -> Settings -> Preferences section.

Visibility and access to the Admin Area requires use of the administrator account.