I don't know why BI has such a short default setting for recording after motion stops. Lots of times people can enter a frame, trigger motion recording, but then stand or sit there in-frame and not trigger it again until they leave even while fiddling on their phone, sitting in your car going through your stuff, whatever. Anyway, anijet has it right. I'll attach a snapshot. It's called the "Break time". Mine's set to record for two minutes after motion stops in case someone stands still or doesn't move much for a while. With it set at 2 minutes I generally only miss cat naptime when they're curled up.
Also, snapshots are saved in your
BlueIris/New subdirectory. An attached pic that shows "Folder: New" in the Record tab right under the green "Profile 1" will show the control to change it, but you probably just want to know where it gets saved? Or are you trying to automagically send each snapshot to wunderground somehow?