All sensors must be closed before you are able to arm your system from the panel. Bypassed sensors offer no protection and cannot cause an alarm. Use bypass if you want to arm your system with one or more sensors open and intentionally unprotected.
Active sensors can be seen under the Active category on the right-hand side. These sensors will be bypassed automatically as you arm your system.
You can also manually bypass any sensors at time of arming by diving into the All list, and selecting the specific sensors you want to bypass.
Note: If you arm or disarm your system using the mobile app, any sensors that are currently open will be automatically bypassed. To see a list of all sensors that are active or open, click on the Security System panel card for the statuses of all of your sensors.