Tab: Marketing > Notifications. Both Yes (default) / No, global only.

• POS Orders Show Notifications Count – shows a badge, in the header of the Customer Orders page (admin/checkouts), with the combined count of unread new Grab & Go, Pickup, and POS Menu orders.
• POS Orders Update Notifications Count – (together with Show Notifications Count) lets that badge, and the matching counts on the POS ordering screen, refresh live from the notification stream when a new order comes in, without reloading the page.

Both depend on Enable Notifications being Yes.