Hint Request for Savor

I’m finding it rather frustrating to try and find a path through this game, given the timed text and the inability to save. But on top of that, the walkthrough doesn’t make sense to me – and I feel like I’m just missing part of the interface or something. The walkthrough tells me to read books to obtain rewind tokens. Now I can obtain books just fine, but this just gives me the message:

and there doesn’t seem to be a way to actually read the book. Any hints?

It turns out you can open up a menu with the Escape button. I wasn’t expecting that, but this probably solves some of the problems I described above. I’ll try again!