Changing zoom from combobox doesn't update the blue rectangle in navigator
Say your default zoom is 100%.
Change the zoom to "Page Width".
The first page is positioned correctly. The left edge of the page corresponds exactly to the limit of the display area. Same for the right edge:
With the navigator in the bottom, move the blue rectangle completely to the right:
We expect to see the last page (page 3) positioned correctly. However, it's shifted right. The left edge of the page doesn't fit the limit of the display area, and the right edge is not seen because it exceeds the limit of the display area: