I have used Opera mini for quite some time now, most annoying was qwerty keyboard feature specially on my mobile with small screen. Tried to change to change toggling through settings I found easy way to change qwerty keyboard to default mobile keyboard.
- Click on Opera logo on right bottom of screen.
- Click on Settings.
- Now open Advanced.
- Click on Opera Keyboard. Select the option never.
Now you will be presented with default mobile keypad instead of Opera qwerty keyboard.
Note: check options of your version of Opera, setting might be different for different versions of Opera.