The size of a widget can be changed if supported, but unlike on Android, the size can only be adjusted after placement.

Android 10 (ColorOS 7.0)
Step 1:  Tap and hold the desired  Widget
Step 2:  Drag the white  circles  to change the size
Step 3:  Tap on a free  area  to save the change
  1. Tap and hold the desired Widget
  2. Drag the white circles to change the size
  3. Tap on a free area to save the change

Oppo Instructions
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