The OnePlus smartphone's start screen grid or /-layout can, as usual, be set in predefined grids of 5x5 or 5x6.
Here we can choose whether three, four or five columns should be set next to each other for the app arrangement.
Furthermore, the size of the app icons can be set in three different dimensions.

Android 10 | OxygenOS 10.0
Step 1:  Tap and hold a  free area  on home screen
Step 2:  Tap on  Home settings
Step 3:  Tap on  Home screen layout
Step 4:  Choose a  layout
Step 5:  Tap on  Save
Step 6:  Choose  Cancel  or  Align
  1. Tap and hold a free area on home screen
  2. Tap on Home settings
  3. Tap on Home screen layout
  4. Choose a layout
  5. Tap on Save
  6. Choose Cancel or Align

OnePlus Instructions
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