Can’t delete a social icon at top of sidebar

I have the latest version of Hueman and have activated the latest Add-Ons plugin. But I still can’t access my Social Link icons at the top of the Primary sidebar. It doesn’t appear in the Customizer, and there is nowhere else to reach it. I need to delete one of the buttons from an account I have deleted.

This also means the dead icon is appearing with the others below the Footers (my original Hueman settings before the new Customizer). I cant access anything below the Footer widgets.

Help! Thank you.