Hi, see similar posts.
Category view is a view, where products are displayed from one specific category only. Items view is a view, where products are displayed from different categories. Everytime you click on filter, it will be redirected to items view (e.g. if there are selected two or three categories in filter, it cannot be displayed in category view, where only one category is active)
You can skip category view and let display only items view, like here:
https://www.phoca.cz/jtd/
(instead of following tree: categories - category view - product view will be used: categories - items view (with active category) - product view)
Jan