I'm actually not sure how you are achieving this, but looks to me like hidden subfolders of the portfolio folder. Technically, it's not really "filter", but from the visitors perspective, it's pretty much the same. In your case, why not extend the titles "Portfolio > Portraits"? Seems useful and intuitive, as when I click right now, it's not 100% clear what happens when title remains the same.
There seems to be some inconsistent links, sometimes pointing to 404 url. You have added the links across all pages, so you need to make sure the links are always correct across all pages.
metallissimus wrote:It works perfectly, the only thing giving it away is the short disappearance of the content when clicking on a "filter". Can I prevent that specificially for those pages?
Of course in a future version, I would be aiming to add real filter like our demo.files.gallery
. Here you will see filter input, but clickable filters use the same engine and are just predefined filters.