I could have sworn that I had an option of switching to landscape mode in the 'menu options', when I first tried my Oasis last week. However, it has since updated the software to 5.7.4, and I no longer see it. The
Users Manual says (on page 13) that the menu options
may include "Shop in Kindle Store, Vocabulary Builder, Settings, Notes, Portrait or Landscape Mode, About This Book, About the Author, Sync to Furthest Page Read, Reading Progress and Word Wise". Does the book need to have 'Amazon Advanced Typography' (or whatever it's called) enabled for landscape mode to be an option?
I have tried with a couple of different books - including the Kindle Users Manual, but it appears to be gone.
Another thing I find lacking is on the 'home screen'. In the 'list mode', there used to be an indication of the length of each book, in a vaguely logarithmic bar chart. I haven't managed to enable that on the Oasis. Is that a problem in my understanding, or a missing feature of the Oasis?