Cannot fix the black line on Huawei Tablet split screen

Setting steps:

1. First, slide the phone screen upwards on a blank space on the phone desktop.

2. Find the two rectangular icons on the right side of any application and click them to split screen. Instructions for use:

1. Start split screen with your knuckle: After opening an application that supports split screen, touch the screen with one knuckle with a slight force, making sure that the knuckle does not leave the screen, and then drag the knuckle with a slight force. across the screen to activate split screen.

2. Long press the recent key to start split screen: After opening an application that supports split screen, long press the box to start split screen.

3. Other split-screen methods: Click the square box of the navigation key to enter recent tasks. If you are using gesture navigation, you can swipe up from the bottom edge of the screen and pause to enter recent tasks, and then Select an app that supports split screen and click Split Screen above the app to enable split screen.

4. Smart split screen: When watching a video in full screen, if you receive a text message or message reminder, a banner will prompt you to split the screen.