Repräsentant setzen (Set preview image or banner)
Kitodo 2 offers the "Set preview image" = Repräsentant setzen function which selects the preview image in the metadata editor. Image 1 is set by default. In the METS, the selected mets:file-element is labelled with @USE="banner".
I have not found a function in the Kitodo 3 UI to change @USE="banner" in the METS.
It would be helpful to be able to modify the preview image and select the title page as a preview image instead of the book cover. Digitised items can thus be better differentiated, e.g. in Deutsche Digitale Bibliothek.
Kitodo 2 Feature
This has been discussed here: https://github.com/kitodo/kitodo-production/issues/4017
Although it was made quite clear there, especially for Kitodo Presentation, that a defined teaser image would not be used, I suppose a teaser image is still useful when, for example, you convert to IIIF Manifests, which employ a similar concept called thumbnail. (https://iiif.io/api/presentation/3.0/#thumbnail).