[vertex-four]

Which is an issue as this is not clearly stated, and it appears at first glance to be exactly like the desktop search tools we've been using for the past couple of decades.

UX design is partially about making pitfalls like this clear to users (and, where possible, getting rid of pitfalls altogether).

[batmanthehorse]

It is actually very clearly stated when you first use it (and every time thereafter, until you disable it):

http://core0.staticworld.net/images/article/2014/10/spotligh...