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To close the current page, click File > Close > Page or press the hotkey [Ctrl] + [W]. To close all pages, click File > Close > All Pages or press the hotkey [Ctrl] + [Alt] + [W].
To copy a page, select the page and press the hotkey [Ctrl] + [C] or right-click the page and click Copy Page. The copied page can be cloned by pressing the hotkey [Ctrl] + [V] while inside a Project Tree or right-clicking a page or object in a Project Tree and clicking Paste. This can be done between different projects.
To delete a page, right-click the page to be deleted and click Delete Page > OK on the warning that pops up.