We can search a stored conversation in the messages app of the OnePlus smartphone for searched terms or keywords.

After entering the keyword we can use virtual arrow keys to search between the results found and those marked in yellow.

Android 10 | OxygenOS 10.0
Step 1:  Open the  Messages app
Step 2:  Choose a  conversation
Step 3:  Tap on  Search
Step 4:  Enter a  keyword
Step 5:  Tap on  Search
  1. Open the Messages app
  2. Choose a conversation
  3. Tap on Search
  4. Enter a keyword
  5. Tap on Search

OnePlus Instructions