Bro all the Note 10 plus with snapdragon chipset working HDR extreme my friends using it but this problem is only with my phone its not about supporting low graphic it have the same chipset and ram that other galaxy note 10 plus phones have.
its not doing lag after i change from extreme graphic to low and again to extreme the problem solving but for period time if i close game or answer a message from any other app it will start lag again and i must repeat same changes in graphics again.