How to enable dual screen on Xiaomi Redmi Note 9: all ways + chip-trick

Xiaomi Redmi Note 9 is one of the most popular smartphones in the budget segment, but not all users know about its hidden capabilities. Dual screen (or "split screen") mode allows you to work with two applications simultaneously, for example, watching YouTube videos and chatting to Telegram. MIUI This feature is often hidden or disabled, and in this article we'll look at all the working ways of activating it, from official to "sly" workarounds.

It is important to understand that not all versions MIUI It supports dual screen on the Redmi Note 9 out of the box. In some firmware, the feature is removed or blocked by the manufacturer. MIUI 12.5-14 and ready to share the results. If you find that the option does not work, at the end of the article there is a section with alternative solutions.

What is a dual screen and why you need it on Xiaomi

Split-screen mode allows you to divide the display of the smartphone into two independent areas, in each of them you can open a separate application.

• 📺 Multitasking: Watch streams on Twitch and simultaneously read chat in Discord.
• 📊 Work: Keep Google Docs open and the browser with sources of information.
• 🎮 Games: run an emulator and a guide to pass nearby (although for games it is not always convenient due to the small size of the areas).
• 📱 Social media: Corresponding to VK And at the same time flip through Instagram feed.

Redmi Note 9 is implemented through the system API Android, but Xiaomi often limits it in budget models. Unlike flagships (such as the Xiaomi 13 Pro), where the dual screen is included in two taps, manual activation may be required through the developer's settings or even third-party utilities.

There are limitations:

• ❌ Not all apps support mode (such as some games or banking apps).
• ❌ On resolution screens. HD+ (Redmi Note 9: The areas may look too small.
• ❌ In some versions MIUI function is unstable (applications may spontaneously close).

Official way: how to enable dual screen through settings MIUI

If your Redmi Note 9 is working on your MIUI 12.5 or later, try the standard method. It's the most secure and doesn't require superuser rights.

Update MIUI to the latest version

Close all background applications

Connect your smartphone to charging (recommended)

Check if your app supports split-screen-->

Step-by-step:

1. Open the Settings. → Special facilities → Split screen mode. ⚠️ Attention: Some firmware has a point called Multiwindow or Multitasking. If it's not, move on to the next section.
2. Activate the switch Allow split screen.
3. Return to the home screen and open the first app (like YouTube).
4. Click on the “Recent” button (square at the bottom of the screen) and hold the app icon.
5. In the menu that appears, select Split screen (or Open at the top).
6. Select the second app from the list of recently opened ones.

If the screen is not divided after these actions:

• 🔄 Reboot your smartphone.
• 📱 Check if the function is disabled in Settings → Battery → Battery Optimization (Some applications block split-screen).
• 🔧 Update the firmware through Settings → The phone. → Updating the system.

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If there is no split screen option in the recent menu, try opening the app in landscape mode – sometimes it works.

Hidden method: activation through developer settings

If the standard method didn't work, try enabling the feature through developer mode. MIUI, But it requires caution - incorrect settings can lead to failures.

How to open the developer settings:

1. Go to Settings. → The phone.
2. Find the MIUI version and tap it 7 times in a row.
3. Enter the password from the lock screen (if requested).
4. Return to the main settings menu and a new section for developers will appear.

Further action:

1. Open the settings → Additional → for developers.
2. Find the option Multi-window or Force resize activities (if the name is in English).
3. Activate it and restart the smartphone.
4. Try to run the dual screen again through the recent menu.

If there is no Multi-window option:

• 🔍 Use the search by settings (the magnifying glass icon at the top).
• 📝 In some firmware, the feature is called Force Desktop Mode or Enable Freeform Windows.
• ⚙️ Check if the "Special Features" in Settings are disabled → Annexes → Application management.

Alternative ways: third-party applications and workarounds

If system methods don't work, you can use third-party utilities, which aren't always stable, but they often save on older versions. MIUI.

Top.-3 double-screen:

• 📱 Split Screen Launcher — creates a shortcut for a quick split-screen launch.
• 🛠️ Floating Apps – allows you to open applications in floating windows (alternative to split screen.
• 🔧 Taskbar — adds a taskbar as on a PC, from where you can run applications in multiwindow mode.

How to use Split Screen Launcher:

1. Install the app from Google Play.
2. Open it and grant permissions to Overlay over other applications.
3. Select the two apps you want to open in split mode.
4. Press Launch Split Screen.

⚠️ Note: Some banking applications (e.g., SberBank Online or Tinkoff) block multi-window operation for security reasons.

On the Redmi Note 9 with MIUI 13+ Taskbar is more stable than the rest, but requires manual adjustment of the screen resolution in its parameters (optimally — 720p smooth-work).

Why the dual screen may not work: common problems

If you followed the instructions but the function never worked, the reasons may be as follows:

A few more nuances:

• 🔋 Battery charge: In dual screen mode, the smartphone discharges 20-30% faster.
• 📶 Network Connection: With a weak Wi-Fi or mobile internet signal, applications can hang over.
• 🔒 Security: Do not enter passwords from banking applications in multi-window mode – this increases the risk of data interception.

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If the dual screen isn’t turned on in either way, it’s likely your firmware MIUI It doesn't support this feature at the hardware level, and only flashing it to a custom version of Android (e.g., Pixel Experience) will help).

How to optimize work in double screen mode

Even if you’ve managed to enable split-screen, it’s not always convenient to use on the Redmi Note 9 because of the small screen (6.53) and modest specs. Here are some tips to improve the experiencia:

Size settings for windows:

• 📏 Drag the dividing line up or down to change the proportions of windows (e.g., windows, 70/30 instead 50/50).
• 🔄 Swap apps in places by dragging them behind the title.
• ❌ To close one of the windows, drag the dividing line to the edge of the screen.

Savings in battery charge:

• 🔋 Turn off Auto Brightness and set the brightness to 50–60%.
• 📵 Enable Power Saving Mode in Battery Settings.
• ⚡ Close all unnecessary background processes through Settings → Annexes → Cleanup.

Acceleration of work:

• 🚀 In the developer settings, disable Windows animation and transition animation (set the value Animation disabled). 0.5x).
• 🗑️ Clear the system launcher cache (com.miui.home).
• 🔄 Reboot your smartphone every 2-3 days – this helps to avoid hanging.

If you use dual screens a lot to work with documents, consider connecting a wireless keyboard via Bluetooth, which will make multitasking even more convenient.

1. Open Settings → Connected devices → Bluetooth.
2. Put the keyboard in pairing mode.
3. Select it from the list of available devices.

What to do if nothing helps: radical methods

If all of these things don't work, there are radical measures that take more time and technical skills, but are guaranteed to include a dual screen.

1. Flashing to custom version of Android

Firmware like Pixel Experience or LineageOS supports multi-window out of the box, but it will require:

• 🔓 Unlock bootloader (official method from Xiaomi takes up to 7 days).
• 📱 Install TWRP Recovery.
• 🖥️ Switch custom firmware through fastboot.

⚠️ Warning: Incorrect firmware can turn your smartphone into a brick.Before the procedure, back up your data via Settings → Additionally. → Backup and reset.

2.Use of ADB-team

If you do not want to sew a smartphone, you can try to turn on the multi-window through ADB (Android Debug Bridge:

1. Install Platform Tools on your PC.
2. Enable USB debugging in the developer settings.
3. Connect the Redmi Note 9 The command is: adb shell settings put global force_resizeable_activities 1
4. Reboot your smartphone.

3.Buying a new smartphone

If multitasking is critical to you and the Redmi Note 9 is not doing well, consider models with official dual-screen support:

• 📱 Xiaomi Poco F5 (s MIUI 14 and a powerful processor).
• 📱 Redmi Note 12 Pro+ (AMOLED-screen and 8GB of RAM).
• 📱 Xiaomi 13 Lite (optimized for multitasking).

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Before radical methods, evaluate how much you really need a dual screen, perhaps more convenient to use picture-in-picture (PiP) mode for video or a quick switch between applications through a swipe gesture on the bottom panel.

FAQ: Frequent questions about dual screen on Xiaomi Redmi Note 9