Unanswered: How to view only one page in Books while full screen?

I want 1) to view only one page at a time in my book while 2) Books is in full-screen mode. My aim is to read with a completely blank background. How do I do this?

The community-suggested method of dragging the app in until there's only one page and then going full-screen doesn't work. Any time I go to full-screen mode it shows me two pages. And I can't find a way in the menu bar (or Googling) to do this. There's an app on Google Chrome that blacks out the screen aside from the block of text you are reading. Is there any such setting or app for Macs?

If there's no way to do this, it begs the question: Does no one at Apple have ADHD and find it difficult to focus on reading when there's a bunch of visual clutter on the screen? This is what I experience when Books is not in full-screen mode and I see the desktop or whatever other apps I have open in the background. The very fact that there's a fairly popular Chrome extension that provides a blank background when reading pretty clearly states that other people desire this feature as well.

The two-page view is worse than background distraction. I'm not only distracted from what I'm reading, if I can't help but glance to the right, I'm skipping ahead in my book. I don't even think this is an ADHD thing. Surely I'm not the only person in the world who when reading something very suspenseful has to maintain the discipline to not skim quickly to get to the resolution. Do people calmly and stoically read when they wanted to know whether some Harry Potter or GRRM character was going to live or die in the scene? I'd bet plenty of readers were reading frantically and fighting the urge to skip ahead to find out what happens. When reading a physical book I'll even put something on the page, a ruler or my hand or something to force myself to read carefully line by line. Maybe I'm a weirdo this way, but I have no doubt I'm not the only one.