Users of Xiaomi, Redmi and Poco smartphones often face a situation where an unusual crescent icon appears in the status bar, which does not indicate the presence of hardware problems or critical system errors. On the contrary, it indicates the activation of one of the most useful features of the Android operating system in the shell. MIUI or hyperos.
The appearance of this indicator means that the device is enabled Do Not Disturb mode, in which the smartphone limits incoming notifications, calls and system sounds to avoid distracting the owner from important tasks or recreation.
In this article, we will take a look at all aspects of silence, how to customize it to your individual needs and how to quickly shut down, and you will learn how to create flexible schedules and exception lists to keep really important calls from missing, even when full noise blocking is activated.
The main purpose of the “Do Not Disturb” regime
The main purpose of the crescent icon is to visually inform the user that audio and vibration notifications are temporarily blocked. It's not just the "quiet mode" we're used to seeing in old phones. MIUI offers deep settings that allow you to completely isolate the device from the outside world or, conversely, leave communication channels open to selected contacts.
When you see this symbol, it means that the smartphone has moved into a priority state, system sounds, notifications from applications and incoming calls are processed using a special algorithm, many users confuse this mode with the usual silent mode, but the difference between them is huge in terms of functionality and control over notifications.
Importantly, activating the feature doesn't mean it's completely unavailable. You can set the device up so that repeated calls from the same number for a short period of time still pass, and this is an implementation of Emergency Bypass, which can save lives in a critical situation.
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Do Not Disturb mode is a smart notification filter, not just a speaker sound switch off.
Differences from the usual silent mode
Many Xiaomi owners mistakenly believe that the crescent appears when you switch the lever or volume button to the "no sound" position. However, the standard silent mode only reduces the volume of media and calls to zero, but continues to vibrate and shine the screen at notifications. Do not disturb mode works at the level of software interrupts.
In normal quiet mode, apps can wake up the screen, the LED light (if there is one in the model), and the phone vibrates in the pocket. In activated crescent mode, the screen remains black, the vibration is turned off completely (unless exceptions are configured), and notifications are hidden from the curtain or marked as quiet.
The difference is also the alarm clock behavior: In standard silent mode, the alarm may fail if the user accidentally turns the alarm clock down in the sound settings. In Do Not Disturb mode, the alarm will always work, regardless of the general volume settings, as the system prioritizes it above system constraints.
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To quickly switch between modes, add the "Sound Modes" widget to your desktop or use the side control panel.
How to turn on and off mode through settings
The notification lock function in Xiaomi smartphones is as convenient as possible. There are several ways to activate and deactivate this state, each of which is suitable for different use cases. The fastest method is to use the control center.
To access quickly, swipe down from the top right corner of the screen (or up, depending on the version of MIUI). In the quick settings panel, find an icon with a crescent image. Clicking on it instantly activates or disables the mode. If the icon is not visible, you may need to deploy a full list of switches.
More detailed settings are available through the system menu. To do this, go to Settings → Sound and vibration → Do Not Disturb. Here you will find the main feature switch. Also in this menu you can set up automatic activation on a schedule or when you start certain events, such as sleep or driving.
☑️ Checking the settings of the mode
If the icon is on fire but you want to remove it, just tap the crescent icon in the notification curtain again. If the feature doesn't turn off or turns on itself, check the automation settings in the menu described above. Often users forget about the "Bedtime Time" schedule enabled.
Scheduling and automation
One of the strengths of MIUI is that it allows you to automate tasks in a flexible way, so you can set your phone up to go into silent mode at a certain time, and that eliminates the need to remember to manually activate every night.
To set your schedule, go to the Do Not Disturb menu and select Schedule or Scheduled, where you can set the start and end times for your schedule, for example, from 23:00 to 07:00, the phone will automatically block notifications, ensuring healthy sleep.
There's also a Sleep Mode feature that's integrated with your health system, and when you turn on this mode, not only does the phone block sounds, but it can darken the lock screen and turn off the screen lift when you tap, which helps reduce the effects of blue light and visual stimuli before bedtime.
What happens if the phone runs out on schedule?
In addition to time frames, you can set up activation for events, such as when you connect to a Bluetooth headset in a car or when you start the navigator, the phone can go into a mode that allows only emergency calls, which increases driving safety.
Creating a list of exceptions and priorities
A critical setup is to create an exception list; complete isolation from the world can lead to missing an important call from loved ones or colleagues; the system allows you to create a “white list” of contacts, notifications from which will pass even when the active crescent icon is active.
In the mode settings menu, find the “Exceptions” or “Allow notifications from” section, where you can select specific apps or contacts, for example, you can only allow calls from “Favorites” or from repeated calls (if the same number rings twice within 3 minutes).
You can also customize the behavior of messages, so you can allow notifications from messengers like Telegram or WhatsApp to be displayed, but hide their content on the lock screen, which strikes a balance between accessibility and privacy.
| Type of exception | Description of action | Recommended use |
|---|---|---|
| Selected contacts | Calls and SMS from asterisk-marked numbers | For family and emergency services |
| Repeated calls | The call passes if the number rings again. | In case of emergency |
| Alarm clocks | The alarm clock is always on. | For the daily rise |
| Media files | Reproduction of sound in video and games | For fun without calling. |
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Add your loved ones’ contacts to the Favorites list in the phone book so that their calls always go through lockdown.
Resolving problems and frequent questions
Sometimes users experience a crescent icon burning constantly, even though they did not manually turn on this mode, which can be caused by third-party applications that have access to Do Not Disturb mode management, or system process failures of System UI.
To fix the problem, try restarting your device. If that doesn't work, check the list of installed applications with system access rights. Often these features have sleep apps, habit trackers or memory cleaners, and it's worth checking if Pocket mode is enabled in locking settings, which can simulate silence behavior.
⚠️ Warning: If the crescent icon doesn't disappear after rebooting and resetting, it could indicate a software conflict.
In some cases, the problem is solved by updating the system to the latest version. Xiaomi developers regularly release patches that correct errors in the notifications and system indicators. Check for updates in the About Phone → MIUI version.
Why is the crescent burning when I turned the sound off?
Will the alarm clock work in this mode?
Can I hide the crescent icon from the status bar?
⚠️ Warning: Third-party applications for hiding system icons may require dangerous permissions. Use only proven launchers from the official store.
Understanding the crescent icon allows you to effectively manage your attention. Using the tools described above, you will turn your smartphone into a smart assistant that only bothers you when it is really necessary, leaving time for rest and work without unnecessary noise.