If a collection is set as a widget, it must be possible to group/ungroup (or expand) nested objects.
It’s now possible for page, why not for collection?
But if now a widget of a page with collection can expand collection, a widget of a collection cannot expand sub-collection.
As for the extended display (complete list), available for example on “Favorites” or “Recently edited” but not elsewhere, I think it’s a shame that useful features aren’t more widespread.
when I started Antype a couple of weeks ago there was a very confusing thing with the views of types in the sidebar widgets:
With collections, that are meant to be used folder-like it is not possible to choose hierarchical view in the widget. So, you cannot use them like folders to build up a tree-like structure of collections/folders.
On the other hand, with all the page-formated types like page and note and project and task etc. it is possible le to choose hierarchical view in the widget and it works quite well.
It took me a while to find out, that collections are able to show hierarchical view if you do the following:
Pin a page of your choice to the widget sidebar (PKM-Central in my example)
Choose hierarchical view for the page in the widget setting
Insert a link to the collection you want to show (here Anytype)
Find the collection nested in your page within the widget.