Permanently bypass as sensor

Hey Folks,

Looking for some help here! I could have sworn I was able to permanently bypass a sensor (in this case a motion sensor) I have guests staying for a while in a room that I would usually have a motion sensor in. Up until last night that seemed to be working (or at least they've been very still) but now it looks like the sensor reverts back to active every time I disarm the system after bypassing that sensor. 

Any help would be much appreciated!

Best,

frustrated user.