A search will look at the title, author and series name.
How is sorting a mess? The five choices work exactly as named.
Kobo do no load tags in any way, hence no filtering.
All the lists are circular. Scroll back from the first page and you get to the end and forward from the last takes you to the start. To get somewhere else, tap the "Page x of y" and popup will prompt for the page number to go to.
As you are probably a new Kobo user, have a look at
here for the basic UI standards.