Manage Notifications for Individual Apps
If one chatty app keeps popping up over whatever you're doing, or a messaging app reveals message previews on the lock screen when you'd rather it didn't, the fix isn't a single master switch. On Xiaomi phones, every app has its own notification behavior for sound, pop-ups, banners, and lock screen visibility. Without adjusting the right app individually, the annoying alerts keep coming back.
Set a Custom Timer Ringtone
If the timer on your Xiaomi phone keeps playing the same generic tone, you probably want something you actually notice - or one you can tune down for lighter naps. MIUI lets you swap the timer sound for a pre-installed ringtone or your own .mp3 file, but the option sits several taps deep inside the Clock app and is easy to miss. Picking the wrong file type can also mean silence instead of a sound.
Change Alarm Volume
If the alarm on your Xiaomi phone barely wakes you up or does not go off loud enough, the alarm volume is set too low system-wide. This one setting controls every alarm you create, and it stays the same even after the snooze function kicks in.