I crop the pages close at the top and bottom so that it looks like one continuous page when vertically scrolled. The notation can still be read when view from a 2 foot distance [portrait] on he Galaxy. When/if I want it really, really big I just switch to landscape. This works well on both the 12.2 and 10.5 screens [Galaxy and Asus]. Just as a note, I use night mode, white on black background. Close cropping works and is usable/readable at arms length on the Nook HD in landscape also.
Dell Latitude 13.5" 2-in-1 Ubuntu/Win 11
Samsung Note Pro SM-P900 12.2 Android 5.0.2
Samsung S7+, Android 12
Samsung Note Pro SM-P900 12.2 Android 5.0.2
Samsung S7+, Android 12