Hi,
Doing this makes no sense since the breadcrumbs are navigation - so they should display the structure, way to the current document. If you want to display just current page title, why don't you use just e.g. static text or HTML web part and in the text use
macro expression for current document, e.g.:
{%cmscontext.currentdocument.documentname%}
Best regards,
Juraj Ondrus