The View your affected IDs button was implemented following this feature request:
https://forum.inaturalist.org/t/view-affected-content-after-taxon-change/29776
Although it doesn’t seem to have been implemented exactly as I expected. It only shows IDs that were updated (which makes sense given the button), but the notifications are triggered on observations you follow that have an updated ID or are part of a group that was changed, even if it wasn’t your ID that was updated. You have observations that used to be in Hylinae but are now in Hylidae, so you got the notification, even though your IDs weren’t updated and there weren’t even any IDs of Hylinae on your observations.
I’ve considered making another request to address this, but haven’t gotten around to it.