By default, the Samsung keyboard automatically capitalises the first few letters of each sentence, but you can also disable "Auto capitalise" in the Samsung 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 capitalise
  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 capitalise

Samsung Instructions
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