By default, the "Show Palm" function is activated on the Samsung device. This is a gesture that can be used to take photos (selfie). By showing the palm of your hand, a short timer is started (3 seconds) until the shutter is released automatically. This function is especially helpful when the Samsung device is a long distance away, for example on a selfie stick. In the camera settings, "Show Palm" can be switched on/off.

Android 10 (One UI 2.0)
Step 1:  Open the  Camera -App
Step 2:  Open the  Settings
Step 3:  Tap on  Shooting methods
Step 4:  Enable or disable  Show palm
  1. Open the Camera-App
  2. Open the Settings
  3. Tap on Shooting methods
  4. Enable or disable Show palm

Samsung Instructions