It would be incredibly helpful if the mobile app allowed font size settings to be saved per resource, rather than applying one global font size across all open texts.
For example, it's preferable to increase the Hebrew font size up one or two notches. This makes the English text oversized and reference materials difficult to read.
Having font size customizable per resource would improve readability, make study more comfortable, and give users more control over their experience. Ideally, the app would remember the font size I last used for each text and apply it the next time I open that specific resource.