Turning on alarm without securing sensored zones

I just noticed this but it's actually possible to turn on the away alarm WITHOUT securing all the sensored zones. Please tell me there's a way to change this. I've looked in all the settings. None of them changes this behaviour. This is incredibly unsecure. If I left the window open and turn on the alarm as I leave, I'm not going to know that the window is still open. The alrm will simply arm leaving a vulnerability in the system. I tested this with the front door. It doesn't matter, the system will arm anyways. I'll think everything is fine and secure, but reall it's not.