Redmi 9a phone in the more settings option, tap into the split screen to select a screen gesture can be split.
1, first of all, in the open cell phone settings, click "more settings" option.
2, and then in the open page, click on the "key shortcuts" option.
3. Then in the opened page, click on "Go to Split Screen" option.
4. Finally, on the Split Screen page, select a split screen gesture to split the screen.