Sticky Zoom, Setting Default Zoom... for bad eyes

[BLUEFROG]

Welcome @sashk

There is no default zoom level for PDFs.
See this…

PDF size in preview

If you enable Automatically resize in DEVONthink’s Preferences > Media, these are the automatic sizes you’ll see when select PDFs. Single Page = Zoom to Fit Single Page Continuous = Zoom to Width If you deselect the option, the PDF displays Actual Size. Other manually zoomed values are not preserved. Development would have to assess that.