[Zubersoft]

If you zoom outside the annotation mode while using the vertical scrolling display mode, it zooms all pages the same amount and saves that zoom in the database so that the next time you load the song, it zooms that amount. Zooming in the annotation editor is more of a temporary action, as the zoom is cleared when exiting the annotation editor by default. So that is why you only see the zooming applied to a single page when annotating. Having said that, there is unusual behavior if you uncheck the option to "Reset zoom after exiting", but then you zoom in while using the vertical scrolling display mode. If you do this, then you can get different zoom amounts on pages even after exiting the annotation editor. That is undesired behavior, so I will probably adjust this so that if that setting is unchecked, zooming in the vertical scrolling display mode is applied to all pages while in the annotation editor.

I'm not sure what you mean by your question about where to choose zooming with two fingers. The pinch gesture is the only way to zoom at the moment. If you open the song overlay, tap the second icon at the bottom left and then Zoom/Pan Settings, you can change some zoom-related settings there, such as whether zooming is saved in the database or not. 

Mike