My Kindle always showed the amount of the book left to read at the bottom of each page but, for some reason, that has suddenly disappeared. Could you please tell me how I can replace that feature?
there are two ways:
tap in the lower left corner and cycle through the options
open the Aa icon and navigate to Reading progress (or something similar) and select the option you want
however, as not all books have "real" page numbers you may only have the option of Location or Time left in Chapter/Book