The "keys" field in the Filter Results UI needs to be more user friendly or state that it's contents must be an array

It's not immediately apparent what content the "keys" field expects. Currently, it's just an input field, and from the name one would think that copying and pasting a key into that field (and possibly a few of them separated by commas) would get the expected result--when indeed it does not.

We should either change how the field is built/displayed so that it is obviously for creating a list of keys (perhaps a "tag" adding style UI) or at least add a note that states how keys should be formatted when entered into that filed (i.e., ["key"] or ["key","otherkey"]).