Stored wireless networks that are no longer needed should be removed/deleted from the Samsung device; when wireless is turned on, the Samsung smartphone or tablet will constantly search for stored available wireless connections.

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  menu
Step 5:  Tap on  Advanced
Step 6:  Tap on  Manage networks
Step 7:  Choose the  network  you want
Step 8:  Tap on  Forget
  1. Open the Settings
  2. Tap on Connections
  3. Tap on Wi-Fi
  4. Open the menu
  5. Tap on Advanced
  6. Tap on Manage networks
  7. Choose the network you want
  8. Tap on Forget

Samsung Instructions