The "Recently played" list cannot be seen in the NA client
I'm not sure if this is intentional or a bug across all clients (excluding PBE, which I've taken a screenshot of for comparison).
This player list, usually found below the General friend list group, is no longer visible.
https://i.imgur.com/Q0OVm6K.png
On the PBE, however, it's still there, despite being updated to the upcoming patch 9.14.