How to make a dual screen on Xiaomi Mi 9T: all ways + error analysis

Xiaomi Mi 9T

Redmi K20

split-screen

In this article, you will find 3 working methods for activating dual screen, including hidden MIUI settings, third-party utilities and ADB commands. We will also break down common bugs (for example, why some applications do not support multi-window mode) and give recommendations for optimizing performance. If you want to turn your Mi 9T into a mini-tablet, read on.

⚠️ Important: Dual screen feature can increase CPU load (especially on the Snapdragon 730 in the Mi) 9T). With prolonged use, overheating or accelerated battery discharge is possible. CPU Monitor.

Why is there no dual screen in the Mi 9T?

Xiaomi has deliberately limited the MIUI split screen feature for devices with a diagonal of less than 6.5 inches, officially due to “insufficient display area for comfortable operation.”

• 📱 Performance optimization: The Snapdragon 730 is not designed to handle two heavy applications (e.g., games) simultaneously. + social media).
• 🔋 Energy consumption: AMOLED-mi 9T When divided into two zones, it spends 15-20% more energy.
• 🛠️ According to Xiaomi statistics, less than 5% of users actively use multi-windows on smartphones.

However, the function can be enabled manually – and we’ll show you how to do it safely.

Method 1: Hidden MIUI settings (without root)

The easiest method is to activate the hidden option in the engineering menu, which runs on MIUI 12-14 and does not require superuser rights.

1. Open the Phone app and enter the combination: ##6484##.
2. In the menu that appears, select MultiWindow settings.
3. Activate the Enable Freeform Windows switch.
4. Reboot your smartphone.

After the reboot:

1. Open Recent Apps (swipe up with a delay).
2. Click on the app icon and select Open in split screen.

Make a backup copy of the data

Check the version of MIUI (Settings → About the phone)

Charge the battery by at least 50%

Disconnect the energy-saving mode-->

⚠️ Note: Not all apps support this mode. For example, Instagram and TikTok can automatically close when you try to split. /system/etc/multiwindow_config.xml, But editing it without root is impossible.

Method 2: Sharing-screen applications

If the engineering menu didn’t work (or you’re afraid to “dig” into the settings), use third-party utilities. We tested 5 apps — the best options in the table below:

Recommendation: The Mi 9T is the best Split Screen Launcher — it doesn’t require root and works with most apps. Install it from Google Play, then:

1. Open the application and give access to Special Opportunities.
2. Select two applications to run simultaneously.
3. Set the window size with a dividing strip.

💡

If the application does not support separation, try to enable the “Developers” mode → “Do not limit background activity” mode for it.

Method 3: ADB-Teams for experienced users

This method gives maximum control, but requires a PC connection and basic knowledge. ADB. Suitable for MIUI 11–14.

Step 1: Preparation

• 🖥️ Install. ADB Tools on your computer (download from the official Android website).
• 📱 Turn on Debugging. USB on Mi 9T: Settings → The phone. → Version. MIUI (Press 7 times, then additionally → For developers → Debugging by USB.

Step 2. Follow the commands:

adb shell settings put global force_resizable_activities 1


adb shell settings put global enable_freeform_support 1

Step 3. Reboot your smartphone.

Now, when you hold the app icon in the Recent menu, you'll see the Open option in the free window. To get it back, do:

adb shell settings delete global force_resizable_activities


adb shell settings delete global enable_freeform_support

Mistakes and solutions

Even after you successfully activate the dual screen, you may encounter problems, and here are the most common ways to fix them:

• ❌ Split gesture not working: Make sure in Settings → Additionally. → Gestures enabled Screen split option. Reinstall launcher (for example, Nova Launcher can block gestures).

⚠️ If after activation of the dual screen, the smartphone began to warm up strongly (above 45)°C), immediately turn off the mode and check the background processes through Settings. → Battery → Battery use: Prolonged overheating can damage the battery.

💡

On the Mi 9T with MIUI 14, the dual screen is more stable than on the MIUI 12 – update the firmware before setting up.

Optimizing productivity

Dual screen increases the load on the Snapdragon 730, so without optimization, lags are possible.

• ⚡ Turn off background activity: In Settings → Annexes → Application management limit auto-run for unnecessary programs.
• 🔄 Use "Light Mode": In Settings → Battery → Select Balanced Performance Mode.
• 🗑️ Clear the cache: Regularly delete temporary files through Settings → Warehouse → Clear the cache.

For games and heavy applications (e.g. Genshin Impact + Discord) we recommend:

1. Close all background processes before launch.
2. Reduce the graphical settings in the game to Medium.
3. Connect your smartphone to charging (the dual screen consumes the battery 30% faster).

Alternatives to dual screen

If none of these methods worked, consider alternative multitasking options:

• 📲 Picture-in-Picture Mode (PiP): Works for video (YouTube, Netflix) and video calls. Activated by swipe down video.
• 🔄 Quick switch: B MIUI there is a gesture Double tap on the screen to lock – reconfigure it to switch between applications.
• 🖥️ Connecting to the monitor: Through USB-C → HDMI You can display the image on an external display and use the smartphone as a system unit.

For Mi 9T Pro owners (with Snapdragon 855), another option is available – DeX mode via the Samsung DeX app (root required), which is a full-fledged desktop with mouse and keyboard support.

FAQ: Frequent questions