How to Make a Double Screen on Xiaomi 9C: The Complete Guide

Modern smartphones allow you to perform many tasks at once, but the standard mode of use involves an active application on the entire display. Owners of budget devices such as the Xiaomi Mi 9C often wonder whether it is possible to implement a split screen feature to run two applications at once. This is really possible, since the MIUI shell provides built-in multi-tasking tools that do not require superuser rights.

However, the activation process may vary depending on the firmware version and regional settings. Some users confuse the standard split screen mode with more complex interface modifications or engineering settings. In this article, we will discuss all the available methods, from simple actions in the interface to advanced methods through debugging over USB.

It should be noted that the Xiaomi 9C has a screen with a diagonal of 6.22 inches, which imposes certain restrictions on the comfort of using two applications at once. Vertical space is limited, so fonts and controls can become too small.

Standard split screen mode in MIUI

The easiest way to run two apps at once is to use the built-in MIUI feature, which is available by default on most firmware versions, but can be hidden in settings. First, you need to make sure that the feature is activated on the system.

Go to the settings menu and find the section that handles additional features. The path can look like Settings → Additional settings → Floating windows or Settings → Advanced settings → Split screen. Here you need to activate the switch that allows applications to run in split mode.

• 📱 Open the application you want to launch first.
• 📱 Swipe up and hold your finger to go to the menu of running apps.
• 📱 Click on the app icon from above or select “Share up screen».
• 📱 Select the second app from the list or find it manually.

After this, your Xiaomi Mi 9C display will split into two parts, you can drag and drop the boundary between the windows, adjusting the size of each application, but not all programs support this mode. If the application is not compatible, the system will issue a notification.

⚠️ Note: When using a split screen, battery consumption increases significantly, as the processor and graphics accelerator work in a strengthened mode, processing two active processes.

Activation through the developer menu and ADB

If the standard method doesn't work, or if you want to unlock split screen for applications that aren't officially supported by the system, you'll have to use debugging tools, which is a more complex method that requires you to connect to a computer.

First, activate the developer menu on your device. Go to Settings → About Phone and quickly click 7 times on MIUI Version. After the message “You became a developer” appears, you can proceed to further actions.

In the developer menu, find the item "Debugging by USB» You may also need to enable the option "Safe debugging by USB» and confirm the action with the code that will come to SIM-card or account Mi. After preparing the phone connect it to the PC through quality USB-cable.

adb shell settings put global force_resizable_activities 1

This command is forced to enable window resize for all applications, and once it is done, you have to reboot the device. Now try to run the split screen in the standard way, and the restrictions have to be removed.

• 💻 Install. ADB-Drivers and platform tools on the computer.
• 💻 Connect your smartphone with a cable and allow debugging on the phone screen.
• 💻 Enter the command in the command line and restart the device.
• 💻 Check the function in the menu of running applications.

Using third-party applications to divide

When MIUI's built-in tools are not flexible enough, third-party apps from Google Play come to the rescue, creating a virtual environment or using special permissions to force split-screen sharing, and one popular solution is Split Screen Shortcut.

Once you install an application, you'll need to give it special permissions through a special feature menu, which will allow the program to manage the windows of other applications. The interface of these utilities is usually simple: you pick two applications, and they run side by side.

It is important to understand that the use of third-party software can lead to unstable system operation. Xiaomi 9C does not have a flagship amount of RAM, so background processes can be unloaded more often than usual, this can lead to restarting applications when switching between them.

Engineering menu and hidden display settings

There is a myth that you can make a dual screen through an engineering menu by changing the resolution or pixel density. Indeed, you can find display settings in the ##6484## or ##4636## engineering menu, but they are designed to be calibrated, not functionally separated.

Changing the density of DPI (dots per inch) can visually reduce interface elements, creating the illusion of more workspace. However, this is not a full-fledged split screen. Moreover, setting the wrong DPI values can make the interface unreadable, and you have to reset the settings through recovery.

If you do decide to experiment with DPI, write down the initial values, enter them through the commands ADB: adb shell wm density 320. To return to the factory settings, use the command adb shell wm density reset.

⚠️ Warning: Do not change the values in the engineering menu unless you know exactly what a particular parameter is responsible for. Mistudy may cause the touchscreen or communication module to fail.

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The engineering menu is designed to diagnose, not expand, the user experience, and changing the display settings there won't create a real split screen.

Application compatibility issues

Even after all the features are activated, you may find that some applications refuse to work in split mode, a limitation laid down by software developers, for example, in encrypted messengers or banking applications for security purposes.

MIUI has a list of apps that exactly support separation, usually browsers, a gallery, notes, and some social media, and if the app isn't supported, the system will suggest running it in a floating window instead of splitting the screen.

A floating window is an alternative to a split screen, allowing you to move a small app window over the main content. For the Xiaomi 9C, this may be an even more convenient solution because of the small size of the matrix. To activate a floating window, launch the application, go to the task menu and click on the window icon.

• 🚫 Banking apps often block screenshots and screen splits.
• 🚫 Video calling apps may not work properly in a small window.
• 🚫 Heavy games are usually forced to unfold on the full screen.

Optimizing performance when working with two windows

Running two active applications simultaneously puts a strain on the Snapdragon 439 and 3 GB of RAM, which is equipped with Xiaomi Mi 9C. To avoid brakes, it is recommended to close unnecessary background processes before starting the separation mode.

You should also turn off animations from the developer menu, and look for window animation, transition animation, and animation duration, and set them to "No animation" or "0.5x," which will make the interface more responsive and make switching between windows faster.

Watch the temperature of the case. If you run in multi-tasking mode for a long time, the device can heat up. If you notice a severe decrease in performance (trottling), take a break and let the smartphone cool down. Overheating can cause applications to crash.

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To reduce memory load, use the lightweight versions of apps (Lite) if available in the Play Market. They consume less resources when working in the background.

Frequently Asked Questions (FAQ)