The Samsung keyboard offers the possibility of setting an automatic punctuation mark by simply tapping the space bar twice, which sets a punctuation mark (dot). By default, the "Auto punctuate" function is disabled, but can be enabled in the keyboard settings.

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:  Enable or disable  Auto punctuate
  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. Enable or disable Auto punctuate

Samsung Instructions
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