Under Samsung's One UI, the App Overview is accessed by wiping up on the home screen. Alternatively, the App Overview can be accessed via an App button, as was the case with older Samsung models. A shortcut is displayed on the home screen that allows you to open the App Overview by simply tapping on it.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Display
Step 3:  Tap on  Home screen
Step 4:  Enable or disable  Apps button
  1. Open the Settings
  2. Tap on Display
  3. Tap on Home screen
  4. Enable or disable Apps button

Samsung Instructions