Zoom dropbox shows 0% under certain circumstances

[stephanrauh]

• go to https://pdfviewer.net/extended-pdf-viewer/zoom
• reduce the zoom to 50% using the zoom dropdown
• use the secondary menu to modify the spread mode or the page mode (it doesn't seem to matter what you select precisely)

Now the zoom dropdown shows 0%. If you scroll through the pages, the dropdown sometimes returns to the correct zoom setting.