Clicking on 'Full details' should take you directly to the 'Details' tab
When clicking on 'Full details', you are directed to the 'Links and availability' tab, whereas you should be taken directly to the 'Details' tab AND not have to click on 'More item details' once in the Details tab.
When clicking on 'View online', you are taken to the 'Links and availability' tab (which makes sense), so one would expect that clicking on 'Full details' would take you to the 'Details' tab. Most likely, this is what users want when selecting 'Full details' instead of actually clicking on the link.
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Just so you're aware, when using the Library view (library staff members with additional roles) you can configure your default tab via the user settings in Leganto.