To keep track of your Xiaomi smartphone, we can delete alarms or alarm times that are no longer needed by tapping and holding an alarm time, selecting multiple alarms if desired, and simply deleting them.

Android 10 (MIUI 12.0)
Step 1:  Open the  Clock app
Step 2:  Tap and hold an  alarm
Step 3:  Tap on  Delete
  1. Open the Clock app
  2. Tap and hold an alarm
  3. Tap on Delete

Xiaomi Instructions