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To edit a page in the developer portal you have to enter the edit mode. You can only access this as a global admin via the 'Edite Edit Mode' toggle in the navigation area.
If the toggle is active, new elements and options are displayed on the current page:
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To remove a block from a page you have to activate the edit mode and click on 'Remove' in the corresponding block. If the block is used in other pages, the block will be removed from the page automatically. If the block is not in use on any page, you will be shown a dialog where you can choose whether you want to delete the block forever or just remove it from the page.
