Could you go to...
Phone settings > About phone > Model name and Model number
... and post what it says for those 2 (Model name and Model number )
As I thought, you do not have the Samsung S21 FE which has not been released yet.
You have the last year, S20 FE model. The forum covering this is here...
Please remove your screenshot which shows your IMEI numbers or hide them for your own security.
Due to stability and compatibility issues, Chromecast is no longer supported via Smart View on Android 11. If you download a supporting app for Chromecast, such as Google Home, you will still be able to connect. Hope this helps! 🙂