On some devices, dark mode might not work correctly due to the system is forcing an app-level dark mode. We've observed such issues on certain Xiaomi devices (you may follow similar steps if you encounter dark mode issues on other devices), here's how to fix it:

1. Go to your device's Settings > Display > Dark mode > More Dark mode options
2. Turn off "Adjust text and background automatically"
3. Under Individual apps, turn off Notewise.