In the photo above, you can see the tags being identified in the top left of the display. (tomsguide.com)
At the lock screen, click on the power icon towards the bottom left of the display. (thewindowsclub.com)
The page size (a.k.a. the trim size) will be on the bottom - left of the display window, and page count will be on the bottom - right. (bbebooksthailand.com)