As practical as widgets are, sometimes you just want to remove them. There are many reasons for this, including some widgets are simply out of date, others take up too much space or are too intensive in data usage.

Android 10 (MIUI 12.0)
Step 1:  Tap and hold a  widget
Step 2:  Tap on  Remove
  1. Tap and hold a widget
  2. Tap on Remove

Xiaomi Instructions