If you there is bookmark that you no longer need, you can delete it from a view at anytime. You can also delete bookmarks on the page that the bookmark references.
To delete a bookmark
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In the header, click Start page.
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On the start page, click More in the Bookmark tile.
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In the Bookmark dialog, click Delete next to the bookmark that you want to delete.
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In the Delete bookmark dialog, confirm the alert with Yes.