When you view a page with a label, you can click on it to go to the “Labelled content” page.
Click the cog icon to the right under the Confluence header and then “See content from all spaces” to view the content from all spaces that has that particular label. Click “Popular Labels” to view the top labels, with the most popular shown in the largest font. Click “All Labels” to see a list of all labels.
Click on any of these labels to see all of the pages in all spaces with this label.
Watch our Video #75 of the Video Tutorial Series “Learn Atlassian Confluence” and read more on this page of Atlassian’s documentation.