Delete all Libraries and Presets?

How can I delete all of the pre installed presets for all the Cubase devices? Retrologue and Halion 6? I deleted the libraries in the library manager but Halion 6 still shows the names with red dashes next to them. The media bay is potentially really useful to me, but I need to get rid of all this preset stuff because I have no interest in it and it gets in the way.