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Guides for Xiaomi Mi Mix 4

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Turn On/Off Sunlight Mode

Bright sunlight can make the Xiaomi display look washed out or hard to read, especially when checking messages outdoors. If automatic brightness is switched off, a separate Sunlight mode boosts the screen output whenever strong light hits the sensor. Without it active, the display often stays too dim outside even at maximum manual brightness.

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Security & Privacy2

Change App Lock Password Type

If you set up App lock on your Xiaomi phone with a pattern and now want something faster or more secure, you are not stuck with that choice. The lock type you picked during setup can be swapped for a PIN or password at any time, without disabling App lock first.

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Security & Privacy

Manage Device Administrator Apps

An app you want to uninstall on your Xiaomi phone refuses to go away, or a widget keeps nagging you about admin permissions. Device administrator apps get elevated rights to change security settings or wipe data remotely, which is exactly what blocks a normal uninstall. Turning off that permission is usually the fix before the app can finally be removed.

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Network & Connectivity2

Change SIM PIN

The PIN that comes preset on a new SIM card is rarely one you can memorize, and typing the wrong code repeatedly locks the card. On Xiaomi phones you can swap it for a PIN you actually remember, but the option sits a few menus deep under network security settings rather than in the main lock screen settings.

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Storage & Backup2

Restore a Local Backup

If you deleted an app or lost data on your Xiaomi phone, you don't need a full factory reset to get it back. MIUI keeps local backups separate from Google and Xiaomi Cloud backups, and picking the wrong one often leaves apps or settings missing. Knowing which backup type actually contains your data saves time before you start the restore.

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Calls & Messages2

Export Contacts as a VCF File

Switching to a new phone or just backing up your address book can be tricky when the Contacts app on your Xiaomi phone does not offer a simple 'transfer' button. Instead, contacts leave the device as a VCF file, and picking the wrong storage location or account often means the file cannot be found afterward. Knowing where the export lands makes the difference between a working backup and a lost contact list.

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Photo, Video & Media

Download Videos via Mi Browser

Saving a video from Facebook, YouTube or Vimeo on a Xiaomi phone usually means installing a separate downloader app first. Mi Browser can skip that step, but only if you know where the download option for links is hidden in the profile menu. Without it, a pasted video link just opens for streaming instead of saving to your storage.

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System & Settings2

Turn On/Off Auto-Update

If your Xiaomi phone keeps installing system updates overnight without asking, or you never get notified when a new MIUI version is ready, the auto-update setting is likely working against you. Some users want updates to install by themselves while they sleep, others prefer full control before anything changes on the device. This setting decides which of the two happens.

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Photo, Video & Media

Turn Best Photo Marks On or Off

If your Gallery keeps flagging one photo out of a burst as the best shot, MIUI is comparing similar images and tagging the sharpest or best-exposed one automatically. Some users find this helpful for sorting large photo batches, others just want a clean gallery without extra labels. The setting controls whether this comparison runs at all.

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Language & Input2

Reorder Keyboard Languages

If your Xiaomi phone keeps switching to the wrong keyboard language after you added a second or third layout, MIUI is simply using the wrong priority order. The keyboard picks its default language from the order you set in Manage keyboards, not from the one you type most often. Autocorrect and word suggestions follow that same order until you rearrange it.

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Display & Home Screen2

Schedule Dark Mode Automatically

Switching dark mode on and off every day by hand gets tedious, especially when you only want it active at night. Xiaomi phones can handle this automatically, but the scheduler sits right next to the regular dark mode switch and is easy to miss. Without setting a start and end time, the display keeps whatever theme you last picked instead of changing on its own.

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Calls & Messages

Dark or Light Theme for the Phone App

If the Phone app keeps showing a bright white call screen while the rest of your Xiaomi runs in Dark mode, the dialer has its own theme setting separate from the system. This mismatch usually happens because the app theme was never linked to System default, or it got reset after an update. It affects the call screen, contact list and dial pad, not just the notification bar.

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Calls & Messages2

Share a Contact via Message or App

Retyping a phone number into a text message often introduces errors, especially with long international formats. On Xiaomi phones, the Contacts app lets you send a person's saved details directly through messaging or email without typing anything manually. This keeps every field intact and avoids typos on both sides.

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Photo, Video & Media2

Delete Photos or Videos from Gallery

Storage on your Xiaomi phone fills up fast once photos and videos pile up in the Gallery app. Many users don't realize they can select several items at once instead of deleting them one by one. This guide covers the exact steps to clear out unwanted media quickly.

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Notifications & Focus

Show Notification Content Only After Face Unlock

Sensitive notification text sometimes appears on the Xiaomi lock screen before Face unlock has actually confirmed your identity. This happens because the notification preview and the face verification step are controlled by two separate settings on MIUI. Once linked, message content only unlocks after your face data matches.

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System & Settings2

Change the Time Zone Manually

If your Xiaomi phone keeps switching its time zone whenever you travel or connect to a different carrier network, automatic time zone detection is the cause. This network-based setting overrides any manual change you make until you turn it off. Once you know where that toggle sits, you can lock in a fixed time zone yourself.

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Other2

Quick Ball Shortcuts and Behavior Settings

If the floating Quick ball only opens one fixed app or keeps popping up during video playback, its behavior settings are still on default. MIUI lets you change the trigger gesture, auto-hide rules and screen position, but these options sit outside the shortcut list and get overlooked easily.

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Calls & Messages2

Manage Displayed Calendar Accounts

If every linked account shows up in the Calendar app at once, work meetings and private appointments end up mixed together in one view. This happens because the Calendar app displays all synced accounts by default, with no separation between personal and work calendars. You can turn individual accounts on or off without removing them from the device.

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Display & Home Screen2

Turn On/Off Dark Mode

If your Xiaomi screen still glares white at night, straining your eyes and eating into battery life, Dark Mode is probably still switched off. MIUI can flip the whole interface to a dark layout, but many users never find the schedule option that would turn it on automatically at a set time. Without that schedule active, you end up switching the toggle by hand every evening.

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Battery & Power

Enable Keyboard Dark Theme in Battery Saver

If your Xiaomi keyboard stays bright white even after battery saver kicks in, the automatic dark theme switch for the keyboard is turned off. This setting is separate from the general dark mode toggle and only reacts to the power-saving state of the phone. Without it, the keyboard ignores battery saver and keeps burning extra power on OLED screens.

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Other2

Change Press-and-Hold Shutter Button Function

On Xiaomi phones, holding down the shutter button in the Camera app usually triggers a burst shot instead of a single photo. If you actually want continuous autofocus or a locked focus point for a tricky shot, that burst behavior gets in the way. MIUI lets you swap this hold action to Focus or Record video instead.

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Display & Home Screen2

Remove a Home Screen Widget

A widget that once seemed useful can quickly become clutter on your Xiaomi home screen. Outdated info panels, oversized widgets, or ones that constantly refresh data in the background all eat into space and battery life. If a widget no longer earns its spot, getting rid of it is worth doing before it wastes more resources.

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Network & Connectivity2

Set Up a Proxy Server for Wi-Fi

If your network admin or workplace requires traffic to run through a specific server, a plain Wi-Fi connection on your Xiaomi phone will not route it correctly. Without a configured proxy hostname and port, apps either fail to connect or bypass the required server entirely. This affects browsing, app updates and anything that depends on that network policy.

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Calls & Messages2

Filter Contacts by Account

If your contact list mixes phone numbers, WhatsApp entries, and other synced accounts, finding the right person gets messy fast. MIUI keeps every synced account in one long list by default, which makes Calls and Messages harder to scan. A built-in filter lets you narrow that view down to only the account you actually need.

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