The "Auto spell check" does not correct words on the Samsung device, but only underlines them in red and suggests corrections that can be applied by simply typing. The automatic spell checker is disabled by default.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  General management
Step 3:  Tap on  Language and input
Step 4:  Tap on  On-screen keyboard
Step 5:  Tap on  Samsung Keyboard
Step 6:  Tap on  Smart typing
Step 7:  Tap on  Auto spell check
Step 8:  Enable or disable  Auto spell check
  1. Open the Settings
  2. Tap on General management
  3. Tap on Language and input
  4. Tap on On-screen keyboard
  5. Tap on Samsung Keyboard
  6. Tap on Smart typing
  7. Tap on Auto spell check
  8. Enable or disable Auto spell check

Samsung Instructions
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