If a widget does not meet our expectations, for example because it is less functional or larger than we originally thought, it can be removed at any time.
To do this, we tap and hold the widget to highlight it and then tap the remove button.

Android 10 | OxygenOS 10.0
Step 1:  Tap and hold the  widget
Step 2:  Tap on  Remove
  1. Tap and hold the widget
  2. Tap on Remove

OnePlus Instructions