[ghmerrill]

If you are using the single page display mode, bring up the display mode dialog with the tablet in landscape, uncheck "Display half pages in landscape", set the page scaling to "Fit Screen",

I think I did this correctly.  The result is that the page is displayed as occupying the full screen but  is distorted because its width has been increased to do so.

just zoom in until it's the size that you want.

I figured that this must mean to use the Apply Zoom Pan Settings to enable pinch zoom ... and Allow zoom out .... ?

So after that, I can in fact adjust the size of the image -- but it's distorted because it's using the aspect ratio of the screen rather than the aspect ratio of the page being displayed, which is a direct consequence of invoking "Fit Screen" and gets back to my observation that "scaling" here means "filling the screen" rather than "scaling the image".  I still can't truly scale the image since image scaling requires preserving aspect ratio.  Otherwise, you're just "resizing" the image (which doesn't require aspect ratio preservation).

There appears to be no way to correct for this since although the pinch action does allow you scale the image, the image that you're now scaling is a distorted one -- having lost its original aspect ratio via the "fit to screen" step.

I don't see a way to run around this issue while using paging.  If I switch to scrolling, then it appears that I can genuinely scale a page to the size I want (retaining aspect ratio) and simply scroll through pieces that way.  That might work well for me (except you lose aspects of "page turning").  But then the question is:

Is there some way to scale all of the pages in all of the pieces in a (say) setlist without having to do them all one at a time with the "pinch" approach?  Can you do something that amounts to an "apply this scaling to all pieces in this setlist"?