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Zoom is making an element or the page bigger. It's not "opening". Opening creates a different context, usually on a WIMP destop GUI using a different application. Zoom thus shouldn't be a double click on a desktop GUI. It can be appropriate on a dedicated gadget such as an eink ereader to zoom an element/image with a double tap, but not in an ereader program on a regular desktop using the WIMP GUI interface, which every desktop Windowing OS from 1976 did. MS started to make confusion on Win8 and Win10 by hybridising the desktop with phone/tablet GUI elements which is stupid.
I had a win 10 tablet. Only the stupid unwanted tile apps and widgets worked properly with touch. Anything where you wanted Windows instead of Android or iOS needed the keyboard dock (which had an unusable touch pad, no separate left & right buttons and tap poor) and a mouse. So a netbook was or small laptop was more use.
I gave it away.
Calibre and its ereader isn't a phone/tablet app. It's a real desktop application for Windows, Mac and Linux. It would be confusing and counterproductive if it was programmed like a single window fills screen touch based app for iOS/Android.
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