I feel like I'm missing something because this seems like the most basic functionality imaginable, but the button that looks like it would let me sort by date is grayed out.   What am I doing wrong here??   Thanks so much, Cyrus ... View more

I feel like I'm missing something because this seems like the most basic functionality imaginable, but the button that looks like it would let me sort by date is grayed out.   What am I doing wrong here??   Thanks so much, Cyrus ... View more