Symposium proceedings will be published in the ARCoSS subline of the Springer Lecture Notes in Computer Science [LNCS] series, volume 12867.
The proceedings ebook (ISBN: 978-3-030-86593-1) can be accessed using this link: https://link.springer.com/book/10.1007/978-3-030-86593-1
Proceedings of earlier FCT conferences can be found here.