Is there an iPad PDF viewer that can stay zoomed out? Some PDFs have fonts that are too large to maintain an optimal reading speed.  Is there a normal page-scrolling (not flipping) PDF viewer that can stay zoomed out at the zoom level you've pinched to?  Everything I have tried so far automatically zooms back to 100% after releasing the pinch-zoom.
I have found two apps that can do this:
(free) MarginNote has a vertical scrolling mode (though it's not the default) and can stay zoomed out at about 50%.
(requires IAP subscription for this option) PDF Viewer by PSPDFKit GmbH has a vertical scrolling mode (though it's not the default) and can stay zoomed out at about 50% (Settings -&gt; Advanced -&gt; Extended Zoom Out)