Reveal all favourites in new tab page on macOS Safari
There was a "Show more" button at the top-right:



But I couldn't see it in full-screen Safari because I have View > Always Show Toolbar in Fullscreen unchecked:



The slide-out toolbar was covering up the title and "show more" button on the page.

There are multiple ways to reveal them:


Open a Safari window that isn't full-screened
In the new tab page, drag one of the favicons and then put it back in the same spot. The toolbar disappears.
Check View > Always Show Toolbar in Fullscreen