Always screen on
- The "Screen always on" option must be provided because it's helpful to read in screen on mode without the interruption of screen off.
Samim Parvez shared this idea
For anyone visiting here for this feature-
There are many similar requests like this, might help if votes are concentrated. For reference, following one seems to be well detailed: https://acrobat.uservoice.com/forums/595576-acrobat-reader-for-android/suggestions/44799325-always-on-display-when-the-app-is-open