Hi PaNewby,
How did you configure the Items property of the Gallery?
If you create an app based on your data base, on the Browse gallery screen, the Items property would be set looks like below by default:
SortByColumns(Filter(ListB, StartsWith(Title, TextSearchBox1.Text)), "Title", If(SortDescending1, Descending, Ascending))
On the right navigation pane, you could select which field to be shown on the gallery.

Best regards,
Mabel Mao