How to activate downlink GUI in Chirpstack app server?

When I installed loraserver 3.1.0, I found a quick graphical way to downlink data(Enqueue downlink payload) to sensor as shown bellow.

When I upgraded the server to Chirpstack 3.4.1, I couldn’t find this feature anymore. Could someone please point me out
1) Am I doing something wrong in configuration files?
2) Was this feature disabled in 3.4.1?

Make sure your decive is activated, then it should show up.

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@Martin, Thanks for your reply. I have activated my device. I can see status changes to “Last seen at Nov 25, 2019 4:49 PM” . I can see also uplink data. But downlink enqueue GUI never appeared.