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Description of desired behavior
The three work areas each have their own top-level tab and menu structure. This structures the previous flat list of menus and improves orientation: content is separated from personal elements - the profile, personal messages and settings - and instance-level configuration and tools.
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If you switch between menu items and sub menu items of the same or a different work area, the state of the connected workspace is preserved. This allows to e.g. work on the site structure of one site, then change a template, then go back to the site structure and find yourself at the exact same spot in the page tree.
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