how to exclude a reference from bibliography despite using it as a footnote in the text

Hey Guys,

I hope you can help me.

I am trying to exclude several titles from my auto-gererated bibliography, titles which I used as a footnote in the text before

When I try to remove the reference type from the templates, they still appear in the bibilography as blank passages. How can I avoid these blank passages?

Or is there any other way how to remove titles from the bibiliography while using them as footnotes?

Thanks for your advice!