You can only change the Time Zone on your Samsung device if the automatic time and date is disabled, and only then can you change the Time Zone.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  General management
Step 3:  Tap on  Date and time
Step 4:  Disable  Automatic date and time
Step 5:  Tap on  Select time zone
Step 6:  Tap on  Region
Step 7:  Tap on desired  Region
Step 8:  Choose desired  Time zone
  1. Open the Settings
  2. Tap on General management
  3. Tap on Date and time
  4. Disable Automatic date and time
  5. Tap on Select time zone
  6. Tap on Region
  7. Tap on desired Region
  8. Choose desired Time zone

Samsung Instructions
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