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.
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
If you hover your mouse over the grey 'other' bar, you can see a more detailed breakdown of the rest of the devices without needing to download the data as a CSV file.
You can see the device list in Firebase Analytics. In dashboard -> device model click in view device model. You can see list of all the devices with details.