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I think the icon (e3) vs (e2) would reflect the current default version setting. If you press it, it will write the new settings to the Settings store and change to the other icon. Something along those lines. Too many places use the SettinsStore defaultVersion() routine to try anything else.
The idea is the current epub could be either version but not effect the version being currently edited. It just reflects your current choice for new epubs being created.
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