ADF-viewer size

[oviwonkenovi]

I Was Using ADF viewer to show a preview of the document on a view. I like the way in which <adf-viewer> show diferent files so I prefer to use the viever than a simple thumbnail. Are there Any wa to handle Adf-viewer elemen size and zoom from the parent component. As the area used for the viezer is not whole screem y whould like to set the zoom to 50% for example, Aditionally I would like to center viewer content. Y se no options for that on adf-viever configuration. Any Idea of how to manage solve that?

Alternatively i can use thumbnail. Are there any way to get a bigger thumbnail?

thanks