Upcoming Reminders Window Uncontrolable

[Dave Labrecque]

I'm referring to the floating, resizable, independent window that lists all upcoming Lightning reminders up to (I'm guessing) a week out.

Two issues:

1) Sometimes the window doesn't open, and I can find no way to open it.

2) Sometimes I don't want it open, and I can find no way to keep it closed.

Ideas?