It would be nice if the tooltip said “monitored: on” or “monitored: off” since there’s absolutely no common sense reason for the icon to look one way or another. It’s also a different color at the series level versus the episode/season level.
I guess I’m expected to remember that filled in means monitored? Or the other way around? Seriously, I never remember. There is literally zero logic to it.
Maybe even have the icon itself be a green check mark or a red X. Anything that makes sense at a glance instead of what it is now.