Why does the POCO X7 Pro leak sound while calling?

Thank you for your support of Xiaomi products and we apologize for the trouble this has caused you. The sound leakage issue during calls on your POCO X7 Pro is due to how the phone's speaker system works. Particularly when need to better utilize the performance of the upper speaker. The upper speaker is used for both regular media/audio playback and for call audio. During calls, if the volume is set too high, the sound will escape from the speaker, causing the leakage you hear. When you are on a call, please pay attention to adjusting the volume button to reduce sound leakage. You can also avoid sound leakage by wearing headphones. Thank you for your support and understanding.