Note
Recently I owned new Poco device with OLED display and found that material you theme has broken on MIUI/HyperOS so I brought AMOLED mode for you. Please note that this feature is experimental. If you don't see this feature make sure you're using new settings layout. You can access it by tapping "Lab" icon in old settings page. AMOLED mode will work only if dark theme is enabled on your device.