Use Edit sentence view it is much better for rapid learning than sentence view. Edit sentence view shows translation and notes and allow quick fix to any mistakes in timestamp and text.
In Edit Sentence view
- The play button is easy to reach one-handed.
- Play button is positioned such that your finger will never have to to cover text or move out of the way just to read.
Reading is fundamental feature of any ereader and should not be covered by thumb as much as possible imo.
For sentence view you should be able to use keymapper app to display the note. I use it to auto display translation and auto play on paging.