better default zoom control, orientation default and notebook default
If a pdf if portrait, fixed height is best when my chromebook is in portrait mode and fixed width is best in landscape mode to zoom in.
If a pdf is landscape (like slides) fixed height is best in landscape mode.
Default zoom either based on device orientation or notebook orientation would be very useful.
An alternative solution is a notebook-level default zoom level, so I don't have to manually set the zoom for every page