I'm working on Magento 2 website that somebody developed before me. The website has Ultimo Theme.
I'm trying to remove a block with a slider on the top of the home page. In the Ultime guide that block is referenced as "preface" static block (it's located below the navbar and right above the page content). 

The actual block has CSS class "`slideshow-wrapper-additional`", but in the Admin Page in `Content -> Blocks` there is no block with such name.

So, should I remove using the Admin Panel or the direct connection via ftp/ssh?

I have Magento `2.2.9` and `Ultimo Theme 2`.