How to see all device list in Firebase Analytics?

On Analytics -> Dashboard, clicking the three vertical dots then "Download CSV" will give you a CSV with all devices, OS versions, countries, languages, and more, as well as the user distribution for each.

It may also be under the share button (3 connected circles) -> Download File -> Download CSV

There is one way to see the list of devices and OS. In the screenshot you uploaded, click on the Add Filter -> User Property -> {Device Model, Device Brand, App Version, OS Version etc.} will be listed there.

If you have not specified any User Properties your self then also, firebase is Automatically collected user properties. Check the list of properties automatically collected by firebase.

https://support.google.com/firebase/answer/6317486?hl=en

Note: If firebase has collected any of the properties itself you will as I mentioned above.

Good luck!!