Date does not remove

My error. All items must be selected to remove. However, the words “Posted on” remain where the date would have gone.

Well, only half right. There is author, date, category info at both the top and bottom of my posts. Only the top data is removed; the bottom data remains. Example page: https://www.stbedesantafe.org/?p=2439

My theme is Preferential Lite.

This plugin only applicable for default themes by wordpress