Is there a way to adjust the formatting of the Table of Contents?

ChelseaIC
Yes, you will have to write CSS for both like below and change accordingly the symbol I included star.
Custom CSS
#Toc li span.TocText {
   
    text-decoration: none;
}

#Toc li.Complete span.TocIcon:before, #Toc li.Complete.Current span.TocIcon:before, #TocHeader td.Complete span.TocIcon:before, #TocHeader td.Complete.Current span.TocIcon:before {
    content: "☆" !important;
}


Hope it helps

Deepak
That worked perfectly - thank you so much for your help!