Oppo mobile phone keyboard becomes smaller, how to return to normal?

To set the keyboard size of OPPO mobile phone, just call up the input method keyboard in the text input interface like SMS and post-it notes.

Click the icon in the upper left corner of the input method keyboard, and click the floating keyboard option to open the floating keyboard.

Click the icon in the upper left corner of the input method keyboard again, and click the floating keyboard option to close the floating keyboard.

This answer applies to all OPPO models.