If we select the language and region when setting up the OnePlus smartphone, a keyboard language with a suitable layout is automatically added.

If we want to change the keyboard layout, we can select a layout for each selected keyboard language, which will be added additionally.

The following keyboard layouts can be selected by default:

Android 10 | OxygenOS 10.0
Step 1:  Open the  Settings
Step 2:  Tap on  System
Step 3:  Tap on  Languages & input
Step 4:  Tap on  Virtual keyboard
Step 5:  Tap on  Gboard
Step 6:  Tap on  Languages
Step 7:  Choose a  keyboard language/layout
Step 8:  Swipe  left  or  right  to browse the  layouts
Step 9:  Choose a  layout
Step 10:  Tap on  Done
  1. Open the Settings
  2. Tap on System
  3. Tap on Languages & input
  4. Tap on Virtual keyboard
  5. Tap on Gboard
  6. Tap on Languages
  7. Choose a keyboard language/layout
  8. Swipe left or right to browse the layouts
  9. Choose a layout
  10. Tap on Done

OnePlus Instructions