It's not clear from picture what breadcrumbs are. Chapter? Page? Other plugin? It looks like page.
Chapter - remove breadcrumbs from chapter template
Pages - copy core template to theme and remove breadcrumbs there (this theme doesn't have custom page template, it uses core one)
Good idea: create copy of theme.
I am not aware that you can set breadcrumbs off in preferencies.
Or just hide it by css
If something of above is not clear for you, it's hard to answer if I don't know what you know about e107 and I don't want to explain basic things.