Samsung's One UI operating system allows its users to activate "Mobile data only Apps", meaning that selected apps only use the mobile data connection, even if there is a WLAN connection.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Connections
Step 3:  Tap on  Data usage
Step 4:  Tap on  Mobile data only apps
Step 5:  Enable or disable  Mobile data only apps
Step 6:  Enable or disable  apps  you want
  1. Open the Settings
  2. Tap on Connections
  3. Tap on Data usage
  4. Tap on Mobile data only apps
  5. Enable or disable Mobile data only apps
  6. Enable or disable apps you want

Samsung Instructions
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