We can mark all messages from one or more conversations on the Xiaomi smartphone as read, tapping and holding a conversation, selecting several if desired, and tapping Mark as read.

Android 10 (MIUI 12.0)
Step 1:  Open the  Messaging app
Step 2:  Tap and hold a  conversation
Step 3:  Tap on  Mark as read
  1. Open the Messaging app
  2. Tap and hold a conversation
  3. Tap on Mark as read

Xiaomi Instructions
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