How do I disable bookmark previews in the sidebar in Safari for MacOS?

After the last MacOS Sequoia update (15.6.1 -> 15.7) Safari was upgraded to 26.0 and I now how have a short preview for each site for each bookmark in the sidebar. This makes bookmarks in the sidebar borderline unusable as I have a LOT of bookmarks and scrolling them / picking a specific one out of the list is much more difficult now and loading the previews does horrible, horrible things to performance.

How can I switch this off and just go back to one-line bookmarks in the sidebar? This "upgrade" is making Safari borderline unusable for me.