Macbook pro mid 2012 15" Cannot enable transparency effect

Macbook pro mid 2012 15" Cannot enable transparency effect

Hi guys, i installed Success fully macos sequoia 15.14.1 on my macbook pro mid 2012 15". It was and is almost smooth, some lag.. but they are ok. I started to play with settings to improve performance, like remove trasparency, reduce animations and so on. but now i'm not able to reactive the trasparency effect even if settings to reduce transparency is disabled. I tried to reboot mac but transaprency are not back. How can i restore them? thanks

https://preview.redd.it/ywu1m8ktr39f1.png?width=292&format=png&auto=webp&s=5a7fb320b35ec69fce6734c510a051e886a9e59e

Author: @Chocolate-Mediocre