A lot of Games are no longer in 21:9 after the Android 10 update

[Jackroland]

Very disappointed with what I have experienced so far. Even the games that support 21:9 originally like Arena of Valor, PUBG, and Asphalt 9 still have black bars after this update. 

[Strampke]

Did you mail the developers of the apps?

You can find the mail addresses in play.google.com.