The "Site Homepage" setting in the user configuration used to set which page should load when clicking on the Confluence site logo in the header. When the new space navigation is turned on, on initial load of Confluence the user is taken to the homepage, but subsequent clicks will return the user to the dashboard instead.
- Set the Confluence Site Homepage in the User Settings menu to a space (including the user's personal space).
- Click the site logo in the header, note that you're taken to the specified space's homepage.
- Turn on the new space navigation, click the site logo again.
You're taken to the space/page specified in the Configuration.
You're taken to the dashboard.