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By default, the Samsung device sends messages (SMS) via SIM card 1, but you can also select SIM card 2 in the SIM card management settings.

Note: The default SIM card for SMS can also be changed via the status bar.

Android 11 | One UI 3.0
Step 1: Tap on  Settings
Step 2: Tap on  Connections
Step 3: Tap on  SIM card manager
Step 4: Tap on  Messages
Step 5: Choose  SIM 1 / 2
  1. Tap on Settings
  2. Tap on Connections
  3. Tap on SIM card manager
  4. Tap on Messages
  5. Choose SIM 1 / 2
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Samsung Instructions