How to Make a Full Screen Call on Xiaomi: All Ways for Smartphones and TVs

Have you ever seen a situation where, during a video call on Zoom, WhatsApp or the standard phone app, a picture is displayed with black bars on the sides? Or tried to watch a movie on Xiaomi TV but the image did not occupy the entire screen? The problem is familiar to many owners of Xiaomi equipment - and it is solved in a few minutes, if you know the right settings.

In this article, we’ll look at all the possible ways to enable full screen mode on a brand’s smartphones and TVs, from basic MIUI/HyperOS settings to hidden features for specific models. You’ll learn how to remove black fields when calling, expand the display of video in apps, and even set up zoom for games. And if something goes wrong, there’s a section on solution errors at the end of this article.

Important: instructions are relevant for devices on MIUI 14, HyperOS and Android TV 11/12 (including Xiaomi 13/14, Redmi Note 12, POCO F5 and TV series Xiaomi TV A2/Q2). For older models (until 2020) may require additional steps – these, too, we will mention.

1. Full screen mode for calls on Xiaomi smartphones

By default, the Phone app in MIUI and HyperOS shows the call interface with control buttons at the bottom and black bars at the sides, which is for convenience, but many users want to see the largest possible image of the person they're talking to, especially when they're video calling. Here's how to set it up:

The method works for the standard Phone and Google Duo application. For WhatsApp, Viber or Zoom, see the section on apps.

• 📱 Open the Phone app and dial ##4636## (test menu).
• 🔍 Select the item Phone Information → Scroll down to Full Screen Mode Settings.
• 🔄 Enable Full Screen Calling (could be called Force FullScreen on firmware for the global market).
• 🔙 Return to the main menu of the phone and restart the device.

After the next call, the interface will occupy the entire screen. If the control buttons are gone, swipe from the bottom up to return them. On some models (for example, Xiaomi 12T), this method does not work - then use an alternative method through the Developer Settings (see below).

2. Set up full screen mode through “Developer Settings”

If the standard method didn’t work, activate the hidden developer options.This is a universal method that works on 90% of Xiaomi devices, including models with HyperOS.

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Attention: Sloppy changes to the developer menu can cause interface failures. Do not touch the settings associated with animation, debugging or background processes unless you are sure of their purpose.

• ⚙️ Go to Settings. → About the phone and 7 times click on the version MIUI (You'll see a notification that says, "You've become a developer».
• 🔙 Return to the main Settings menu and open a new section → Developer settings.
• 🔍 Find the option Force Full-screen display and turn it on.
• 📱 For video calls, also activate Disable overlays if it is on the list.

Activate the Developer Menu (7 tap-up MIUI/HyperOS)

Check for system updates

Backup of important data

Charge your phone at least 30 times%-->

Once these options are enabled, all apps (including Phone, WhatsApp, and Zoom) will try to stretch the interface to the full screen. If an application distorts the image, go back to the Developer Settings and add this application to the exceptions (full screen exclusion clause).

3. full-screen mode for specific applications (WhatsApp, Zoom, Viber)

Some messengers (such as WhatsApp or Zoom) block the image stretching by default, and require customization:

If the app doesn’t have a built-in full screen option, try forced scaling:

1. Open Settings → Applications → Application Management.
2. Select the desired application (such as WhatsApp) → Permissions → Additional → Change the size.
3. Select the Allow Size Change box and select Full Screen.

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If after stretching the image in Zoom or WhatsApp lost control buttons, touch the screen twice – they will appear for 3 seconds.

4. Full screen mode on Xiaomi TVs (MI TV, Redmi TV)

On Xiaomi TVs (A2, Q2, P1), black fields appear when watching videos or calling through Google TV due to incorrect zooming or screen resolution settings. Here's how to fix this:

• 📺 On the remote, press Settings (cogs) → Image and sound → Screen settings.
• 🔍 Select Screen Mode and set Full (or Just Scan for 2023 models).
• 📏 If the option is not available, go to Additional settings → Scale of the image and turn off Automatic Size Change.
• 🔄 For apps (such as YouTube or Netflix) press the button OK remotely → Choose Change the size.

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Note: On Xiaomi 2020-2021 TVs (e.g. Mi TV 4S 55) the centering of the image may be lost after changing the screen mode. To return it, go to Settings → System → Reset image settings.

For video calls via Google Duo or Zoom on Xiaomi TV:

1. Install the app from the Google Play Store on your TV.
2. Connect your webcam via USB (e.g. Xiaomi Webcam 2K).
3. During the call, click on the three dots in the upper right corner and select Full-screen mode.

5 Problem Solving: Blackfields Remain

If after all the manipulations, the image still does not occupy the entire screen, check these points:

• 🔄 Some videos (like TikTok) are 9:16 and can't physically stretch 16:9 without being cropped. Try to turn on the option to fill the screen in the player (can cut the edges).
• 📱 Firmware restrictions. On devices with MIUI 12.5 and below full screen mode for calls may not work due to Xiaomi's security policy. MIUI 14+.
• 🛠️ If you use third-party launchers (like Nova Launcher), go back to standard. MIUI Launcher and check again.
• 🔌 Problems with HDMI. On TVs black fields when connected through HDMI eliminated by choice of regime PC port-setting.

Critical information: On Xiaomi smartphones with a notch in the screen (such as the Redmi Note 11 or POCO X4), full-screen mode can crop off part of the application interface. To return the display of time, battery and notifications, turn off the option to Hide the notch in Settings → Screen → Full-screen display.

6. Full-screen mode for gaming and streaming

Gamers and streamers on Xiaomi often find that games (PUBG Mobile, Genshin Impact) or streaming apps (Twitch, Trovo) don’t use the full screen.

For games:

1. Open Settings → Special Features → Full-screen gestures and turn on the option.
2. Start the game and select the resolution that matches your screen in its graphics settings (e.g. 2400×1080 for Redmi Note 12 Pro+).
3. If the game supports, activate Borderless Window mode (usually in the display settings).

For streaming:

• In Twitch or YouTube Studio, click on three dots in the player and select Theatre or Full Screen Mode.
• If you are streaming from PC to phone via Miracast, on your phone turn on Settings → Connections → Wireless display → Full screen mode.

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Note: On devices with a MediaTek processor (such as the Redmi 10C or POCO M4 Pro), forced full-screen mode in games can cause overheating. Monitor the temperature through the CPU Monitor app and return the standard settings if necessary.

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For maximum performance in games, turn off full-screen mode in the developer settings and use the built-in game options - this will reduce the load on the processor.

7. Alternative methods: ADB and third-party applications

If standard methods don’t work, you can use advanced tools, but they require caution.

Method 1: ADB-command

1. Install ADB on PC (instruction: official guide).
2. Connect your phone to your PC and type in the command: adb shell settings put global policy_control immersive.full=*
3. Reset the device.

This command forces all applications to use the full screen, but can break the display of system notifications.

Method 2: Appendix Nacho Notch

• Download Nacho Notch from Google Play (requires Android 8.0+).
• Grant permission to overlay over other applications.
• Select Force Full Screen and add the apps you want to add to the list.

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Note: Using ADB or third-party apps may result in blocking some MIUI features, such as navigation gestures or an always active display (AOD).Before experimenting, back up through Settings → Additional → Backup and Reset.

FAQ: Frequent questions about full-screen mode on Xiaomi