1. Click the Settings application for iPhone.

2. After entering the settings page, click "Display and Brightness".

3. After entering the display and brightness page, click "Display Mode".

4. Click to enter the display mode, select "Standard Mode", and then click "Settings".

5. A reminder window of whether to use standard mode will pop up, and click Use Standard Mode. After resetting the display mode, restart the system.

6. Turn on the screen rotation function after restarting, and you can operate horizontally.

7. Support the application of landscape screen on the home screen. When you turn the phone sideways, it will automatically switch to split screen mode.

Second, Apple's mobile phone split screen introduction

1 and the split-screen operation of iOS 9 are all based on multi-tasking, so this need not be said separately. Implementing this operation is very simple. First run an application, then slide from the right side of the screen to the middle, and the multitasking card will pop up. Click on one of them, and it will open in the third position on the right screen.

2. Apple has added multi-tasking and multi-tasking function to iOS9, but the multi-tasking function introduced by Apple this time can only be realized on iPad Air2. Apple has optimized three functions for multitasking:

① Sliding function, allowing users to switch between two applications quickly. This function can be implemented on iPad Air, iPad Air2, iPad mini2 and iPad mini3.

② Split-screen viewing function, which can divide the screen into two parts and run two applications at the same time. Two apps can be split into five or five screens, or three or seven screens, and two apps can run in parallel on the same screen at the same time. It also supports multiple interfaces of the same application. For example, two tags can be placed side by side in Safari browser. This function can only be implemented on iPad Air2 at present.

③ Picture-in-picture function, if the user wants to watch or reply to the email while watching the video, the video will be left on the screen in the form of a floating window, and the size and position can be adjusted at will. This function can be implemented on iPad Air and iPad mini.

3.SlideOver refers to calling multiple task bars, Split View refers to running two applications at the same time, and picture-in-picture can be said to be picture-in-picture.