It makes easy for users to search for an app in app drawer. When we open app drawer the keyboard automatically displays on screen and we can search for any app easily.
Setting Path:
realme UI 7.0: Settings > Home screen, Lock screen & style > Home screen settings > Home screen > Display keyboard when entering app drawer
realme UI 6.0 & 5.0 & 4.0 & 3.0: Settings > Home screen & Lock screen > Home screen mode > Drawer mode > Display keyboard when entering app drawer
realme UI T & U Edition: Long press the Home screen > Home settings > Home screen > App drawer settings > Display keyboard when entering app drawer
realme UI 2.0 & 1.0: Not supported
realme UI R & S & Go Edition: Not supported