Hi. That's fine. I can just re-name the CategoryNavigation view and I'll get the default behaviour back.
The Category Menu (the one down the left-hand side visible when browsing the catalog in desktop mode) is in a fully opened state. If you have a large category tree, it stretches way past the products, looks ungainly and forces the user to do a lot of scrolling. Also, the whole tree should be accessible, not just the sub-categories of the current category as this forces the user to use either the breadcrumbs or the Top Navigation to climb back up through categories.
Hi. In Category Product Collections, the Tab Builder for any Category cannot be re-opened. You have to delete it and start again if you wish to make any changes.