I now see it is possible.
You use the filters to select the recipe category: Baked goods, sub-category bread and rolls.
You also use the filters to select the ingredient category you want to leave out.
After you select it, you change the little plus sign on the green filter icon to a minus. The icon turns black to show you are excluding that ingredient: no sugar, no nuts, no breadcrumbs, no cheese, or whatever you choose.
I was confused because the recipe categories are called categories in one place and recipe types in another.