[rschiks]

The filters watched and hide are applied first. You can have a collection with one movie watched and one not. Depending on the filter you can see a collection with only one movie instead of two. But hey...that's why it's called a filter :-)

exactly well anyway will you be able to have this combined list in upcoming releases?

Well, in a new view it won't be a problem to add (you can immediately take this in account), for the other views it's different. Mainly to the fact that if you have the collection in your list and you select that collection you want to know about the other movies in the selection (at least I would). Sort of what you see now in the movie sets option. Now it only displays the movie info. You have to do something different then.
This is also the reason why I made it a separate menu option (and also Kodi does that)

The collections putting in the list and remove single collection items from the list is not the issue (I could make a setting for that). What happens when you select that collection is. I haven't figured it out what to do....I have some ideas....

BTW it's on the to do list.