Sorry, i didn't even bother to search in the settings. Finding them is next to impossible. I would strongly suggest that every color setting of that type should have a context menu like 'change these colors', instead of digging through endless lists of color settings, were i don't have any idea, what they actually are.
Issue is here, in dark mode i have an almost white background color for the smart favorites esction at the bottom of the list, an some font color that is also very light.
Actually i tried, a bit. No search results for 'smart', as in 'smart favorites'. And if i change colors in the spot you showed, nothing changes. So i'm still stuck here.
I don't think there is a separate color for Smart Favorites.
Are we talking the list of Smart Favorites on a menu or toolbar, not in the file display? It's hard to tell from the screenshot as it's so cropped.
If it's a toolbar or menu, it's a property of the button which generates the list of favorites, and you just have to edit the button. It isn't set to use those colors (or any others) by default, so this would be something you set up yourself in the past and just need to undo the same way you did it.
but i'm not sure if this is the default (multi-)button code, or i had added it sometimes later, a long time ago. Like a lot of the stuff i'm using, which i had set up some 10 years ago.