How to activate screen splitting on Xiaomi Redmi 9C NFC with MIUI 12: full instruction + customization secrets

Introduction: why you need a multi-window mode on a smartphone

The split screen (or multi-window) feature on the Xiaomi Redmi 9C NFC with MIUI 12 firmware allows you to work with two apps simultaneously on the same screen. This is convenient when you need to compare prices in the browser and chat, chat in the messenger and watch videos, or copy text from one document to another. However, many users do not know how to turn this mode on correctly or face errors when using it.

In this article, we will discuss in detail how to activate split screen on your device, which applications support this feature, and how to bypass the typical limitations of MIUI 12.

Important: Despite the fact that the Redmi 9C NFC is a budget device, its hardware capabilities allow you to comfortably use split-screen mode, the main thing is to properly configure the system and avoid common errors, which we will discuss below.

Requirements for split-screen operation on Redmi 9C NFC

Before you try to turn on multi-window, make sure your device meets the following conditions:

• 📱 Version. MIUI: lower MIUI 12.0.3 (earlier versions may not support the function or may work with errors). → The phone. → Version. MIUI.
• 🔄 System Updates: All available updates must be installed.Occasionally Xiaomi adds multi-window support in minor patches.
• 📲 Compatible applications: not all programs support split mode, for example, some games and banking applications may block this feature.
• 🔋 Battery charge: when using a multi-window active, energy consumption increases by 15-25%. Recommended charge level is at least 30%.

If your Redmi 9C NFC meets these requirements, you can start setting up, otherwise you may need to update your firmware or reset (we’ll talk about this at the end of this article).

Step-by-step instructions: how to enable screen splitting

You can activate the multi-window on MIUI 12 in two ways: through gestures or through the menu button. Let's consider both.

Method 1: via the “Recent Apps” button

1. Open the first app you want to use in a multi-window (like Chrome).
2. Click on the “Recent Apps” button** (square in the bottom navigation bar).
3. In the list of open programs, find the application icon and press it for 1-2 seconds.
4. In the menu that appears, select Split screen (or Open at the top/bottom of the screen).
5. Select the second app from the recent list or through All Apps.

Method 2: Through gesture (swipe)

If you have gesture navigation enabled (no buttons), do the following:

1. Open the first appendix.
2. Swipe your finger up from the bottom edge of the screen and hold your finger on the app icon.
3. Drag the icon to the top or bottom of the screen (the zone will be illuminated).
4. Release your finger, the app takes up half the screen.
5. Select the second app from the recent list.

If gestures don’t work, check the settings in Settings → Display → Navigation Panel and select Gesture Navigation.

Update MIUI to latest version |Close unnecessary apps in the background |Check battery (minimum 30%) |Make sure apps support mode-->

Separation screen setting: changing window size and order

Once you activate the multi-window, you can change the proportions and the layout of the windows. Here's how to do this:

• 🔄 Size change: Pull the dividing line up or down to enlarge one of the windows. Minimum size is 25% of the screen.
• 🔀 Exchange of seats: Click on the two arrows in the center of the dividing line to swap apps.
• ❌ Closing the window: draw the dividing line to the edge of the screen or press on ✕ window-corner.
• 📱 Return to full screen: Pull the dividing line outside the screen or double-click on Home.

Note that some apps (such as YouTube or Netflix) may automatically go full screen when playing a video. To avoid this, turn on the Always in the window option in the app settings (if available).

List of applications that support splitting the screen on MIUI 12

Not all programs on the Redmi 9C NFC can run in multi-window mode, here is a list of proven compatible applications:

Important: Secure content applications (banks, payment systems, some games) automatically block split screen mode for security reasons. If you need to use such an application in a multi-window, try alternative methods (for example, floating windows, which we will discuss later).

Problems and Errors When Using Multi-Windows: How to Fix

Even if you did everything right, you can get into trouble. Here are the most common problems and solutions.

• ❌ Function not activated: Check if the option is included in Settings → Special facilities → Split screen. Update the firmware to the latest version MIUI 12.5+.
• ⚠️ App does not support mode: Try using floating windows (include in Settings) → Annexes → Floating windows: Install an alternative app (e.g., use the web version in your browser instead of Instagram).
• 🔋 Strong battery discharge: Close background processes in Settings → Battery → Battery usage. Activate the power saving mode in the battery settings.
• 📱 Screen flickering or braking: Reduce animation in Settings → The phone. → Version. MIUI (7 times) → Window animation = 0.5x. Turn off hardware acceleration in the developer settings (for individual applications).

⚠️ Warning: If the multi-window activation causes the smartphone to warm up, close down resource-intensive applications (such as games or video editors) and let the device cool down. Prolonged overheating can lead to trottling (automatic performance loss).

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If the app doesn’t support split screen, try opening it in the web version via a browser. For example, a Telegram or WhatsApp web client works perfectly in a multi-window even if the official app blocks this mode.

Alternative ways to multitask on Xiaomi

If splitting the screen isn’t right for your tasks, consider other options for multitasking on the Redmi 9C NFC:

• 🪟 Floating windows: Allows you to open miniature versions of apps on top of others. → Annexes → Floating windows. Supported: Calculator, Notes, Camera.
• 📋 Copying between windows: Use the clipboard MIUI (Settings → Additionally. → Clipboard) to quickly transfer text or images between applications.
• 🔄 Quick switching: Double tapping the recent button allows you to instantly switch between the last two apps.
• 🖥️ Desktop Mode (Second Space): Create a second desktop with a different set of applications in Settings → Second Space: Useful for separating work and personal tasks.

Each of these methods has its own advantages: for example, floating windows are convenient for quick access to a calculator or notes, and Second Space will help separate personal and work applications without mixing data.

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Split screen mode is not the only way to multitask on MIUI 12, but floating windows, quick gestures, or even a second desktop (Second Space) are suitable for different tasks.

Optimizing performance when using multi-window

Splitting the screen increases the load on the processor and RAM. To Redmi 9C NFC does not slow down, follow these tips:

• 🧹 Background Clearing: Before activating the multi-window, close all unnecessary applications through Settings → Annexes → Clean up.
• ⚡ Performance mode: Enable Settings → Battery → Performance mode (increases the clock frequency of the processor).
• 📵 Disabling animation: in the developer settings (Window animation) = Off.) will speed up switching between windows.
• 🔄 Auto-cleaning memory: activate the option Settings → Memory. → Autocleaning for automatic RAM release.

If your smartphone is slowing down, try using lighter versions of apps (like Facebook Lite, Messenger Lite) that consume less resources and work better in multi-windows.

⚠️ Attention: with prolonged use of split screen (more than 1 hour), the temperature of the processor can rise to 45-50°To avoid overheating, take breaks every 30-40 minutes or use the device in a well-ventilated room.

FAQ: Answers to Frequent Questions About Screen Sharing