Depending on the selected keyboard language, a corresponding keyboard layout is used. Thus, the QWERTZ layout is used for the German language. The English language uses the QWERTY layout. Besides these two keyboard layouts, there are others such as AZERTY, Dvorak, Neo2, Colemark and PC. The Gboard keyboard on the Oppo smartphone also offers a layout for handwriting.

Android 10 (ColorOS 7.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Additional settings
Step 3:  Tap on  Keyboard & input method
Step 4:  Tap on  Gboard
Step 5:  Tap on  Languages
Step 6:  Choose desired  Keyboard language
Step 7:  Select all  layouts  you want
Step 8:  Confirm with  Done
  1. Open the Settings
  2. Tap on Additional settings
  3. Tap on Keyboard & input method
  4. Tap on Gboard
  5. Tap on Languages
  6. Choose desired Keyboard language
  7. Select all layouts you want
  8. Confirm with Done

Oppo Instructions