Howto delete hidden effects

Hi out there,

I have managed to create effects on slides in an Impress presentation that seem to be invisible or hidden on the slide sorter and outline view.

To expain: When I delete every effect on a slide shown on the ‘Custom Animation’ Sub Menu on the side bar, there are still effects bound to this slide as shown at the outline or slide sorter view (the effects icon is visible on the outer left side of the slide overview).

My question is, how can i modify these “hidden” effects, in which Sub- or Context.Menu could these effects be seen and edited or deleted.

Regards and thanks for any help, Stefan