From some of the other comments, it looks like a rather recent addition by Amazon (around 2021). I got rid of my last Kindle after 2021, but maybe I never got that update.

If it takes some competition for Amazon to finally add some very basic features like this after a decade, I will keep supporting that competition.

I’ve grown frustrated with Amazon in a lot of areas, this was just one small one. I’m looking to divest my dependence on Amazon, and the Kobo isn’t leaving me missing anything.