A “Smart” security system is different from the traditional alarm system panel that you’re used to that requires manually arming and disarming the system using a keypad. The best way to use your new Smart Home Monitor system is to automatically arm and disarm the system as you come and go based on presence. To set this up, configure Routines to set Smart Home Monitor to Armed (Away) when the Goodbye routine is triggered and Disarmed when the I’m Back routine is triggered. You can then automate the triggering of these routines with Everyone Leaves and when Someone Arrives.
Two Way You Smart Home can know you are home
You can set up your phones using the SmartThings app to act as a presence sensor. You can do this for each adult by inviting them to your SmartThings account. This will also allow them to control other smart devices in your home.
Samsung has a fob that can be used as a presence sensor. This will work similarly to a phone's presence sensor. Just configure it as a device on your hub.