How to make a dual screen on Xiaomi Redmi 9: multi-window, split screen and hidden MIUI features

The dual screen feature on Xiaomi Redmi 9 smartphones allows you to use two applications simultaneously – for example, watch videos on YouTube and chat to Telegram, or copy text from the browser into notes. Despite the budget stuffing, the model supports split screen and multi-window mode through hidden MIUI settings. However, many users do not know how to activate these functions or face errors such as “The application does not support multi-window”.

In this article, 3 proven ways to enable dual screen on Redmi 9 (including Redmi 9A/9C/9T models), step-by-step picture instructions, application compatibility table and problem solving. All methods work on MIUI 12, 13 and 14 without superuser rights (root).

⚠️ Attention: On Redmi 9 with 2 GB of RAM, the split screen can brake - close the background applications through Settings before using → Annexes → Clean up.

1. Standard method: split screen through multitasking

The easiest method is to use the built-in split-screen feature, which is available in MIUI by default, which does not work with all applications (for example, games and some banking programs block it), but covers 80% of everyday tasks.

To activate the split screen:

1. Open the first app (like Chrome).
2. Click the Recent Apps button (square at the bottom of the screen).
3. Hold your finger on the app icon in multitasking → select Split screen.
4. Select the second app from the list (e.g. Telegram).

The screen will split into two parts with the ability to change the proportions: pull the dividing line up/down. To exit the mode, press Home or swipe the divider to the side.

Make sure both apps are updated |Close background processes |Plug in charge (battery discharges faster)|Put the application compatibility in the table below-->

Multi-window mode (floating windows)

If split screen is uncomfortable, try multi-window mode, where one application is open in the full screen and the other floats over the top in a small window, a technique that even programs that block split screen support.

Instructions:

1. Open Settings → Special Opportunities → Multi-window.
2. Activate the switch Enable the multi-window.
3. Return to the application menu, hold the icon of the desired program → select the Windows.
4. Adjust the size of the window by dragging corners.

⚠️ Attention: B MIUI 14 Ways to Settings Changed - Look for Settings → Additionally. → Multitasking. If there's no item, update your firmware.

Advantages of multi-window:

• 🔹 Works with Instagram, VK and other "stubborn" applications.
• 🔹 Windows can be moved freely across the screen.
• 🔹 Keeps you up 3-Open windows at the same time (on Redmi) 9 s 3/4 GB RAM).

Split screen (split screen)|Multi-window (floating windows)|Not using.|Another option-->

3. Hidden function: gestures for dual screen

Few people know, but in MIUI There's a hidden gesture to quickly launch a split screen, which works even if the item is not in the multitasking menu. V12.0.8.0.QJCMIXM newer.

How to turn on:

1. Activate Settings → Additional → Full-screen gestures.
2. Open the first app, then swipe from the bottom up and hold your finger on the screen (multitasking call).
3. Without letting go of your finger, pull the app icon upwards – a split screen menu will appear.

This method works even if the "Multiwindow" option is turned off in the settings - the gesture refers directly to the MIUI system API.

Dual screen application compatibility table

Not all programs support split screen or multi-window, and the following are the popular applications tested on Redmi 9:

🔹 How to get around locking? For apps like Instagram or banking services, use multi-window mode or third-party launchers (such as Microsoft Launcher) that emulate a split screen.

Solving Double Screen Problems

If split screen or multi-windows don’t work, check out these points:

• 🔧 Update. MIUI: Go to Settings. → The phone. → System Update: Minimum version for stable operation — MIUI 12.0.7.
• 🔧 Clear the cache: Go to Settings → Annexes → Application management → Systemic → Multi-window → Warehouse → Clear the cache.
• 🔧 Check the developer settings: If previously enabled debugging USB, Turn it off, it can block multitasking.

⚠️ Attention: On Redmi 9A (2GB of RAM, split screens often fail due to memory shortages, so the solution is to use multi-window instead of split-screen or close all background processes before activation.

💡

If the screen “twitches” when changing the size of the windows, turn off the animation in the developer settings (Settings → About the phone → MIUI version → 5 times tap → Developer settings → The scale of the animation window → No animation).

Alternative methods: third-party applications

If the built-in MIUI features don’t work, install one of these apps from Google Play:

• 📱 Split Screen Launcher: Emulates split screen for any application, even blocked. Requires permissions ADB (guideline).
• 📱 Floating Apps: Creates floating windows for messengers and browsers. The free version is limited to 2 windows.
• 📱 Island (Sandbox): Allows you to clone apps and run them in an isolated window (useful for two WhatsApp accounts).

🔹 How to give rights ADB Split Screen Launcher:

adb shell pm grant com.example.splitscreen android.permission.WRITE_SECURE_SETTINGS

Connect the phone to the PC, enable debugging over USB and execute a command in the terminal.

💡

The dual-screen side of the app can reduce Redmi 9 performance by 15-20%. Use them only if the built-in MIUI features don't fit.

FAQ: Frequent questions about the dual screen on Redmi 9