The landscape reading on e-ink works but on certain pages can cause an issue with the default zoom.

When turning to landscape, you will see "half of the page", if by no luck there is a line in the "frontier" of the up part and the low part of the page you won't be able to read that line (half letter on the up side and half letter on the low side).

When zooming out once it can help while still keeping a good reading comfort.