the Samsung device automatically connects to previously saved wireless networks. if automatic connection is not desired, it can be disabled in the respective wireless connection settings. as a result, you need to tap on the found wireless network to establish a connection. if the wireless network is out of range, the connection is disconnected and you need to manually connect again.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Connections
Step 3:  Tap on  Wi-Fi
Step 4:  Open the  settings  of the desired  connection
Step 5:  Enable or disable  Auto reconnect
  1. Open the Settings
  2. Tap on Connections
  3. Tap on Wi-Fi
  4. Open the settings of the desired connection
  5. Enable or disable Auto reconnect

Samsung Instructions
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