If spell checking is enabled, misspelled words on the Xiaomi smartphone are marked as you type. Unlike auto-correcting, spell checking only marks the word and does not correct it. This feature can be turned on/off in the settings.

Android 10 (MIUI 11.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Additional settings
Step 3:  Tap on  Languages & input
Step 4:  Tap on  Manage keyboards
Step 5:  Open the  Settings
Step 6:  Tap on  Text correction
Step 7:  Enable or disable  Spell check
  1. Open the Settings
  2. Tap on Additional settings
  3. Tap on Languages & input
  4. Tap on Manage keyboards
  5. Open the Settings
  6. Tap on Text correction
  7. Enable or disable Spell check

Xiaomi Instructions