I created a view with articles. All I need is to trim titles.
The reason I cannot do this from content types (teaser view) is because the title field is a node module element. (It cannot be deleted, and is too late for that.)
There is an option in views output in the preview mode/contextual menus/rewrite results, but it seems it won't work.
None of the rewrite results options will work. It looks like a bug in the Views module.