Make sure that you have the Content Formatting Macros for Confluence add-on installed into your Confluence. If not, install a free trial version of it.

Click the Edit button (the pencil icon)

To copy all elements on a page: press Ctrl+A on your keyboard and then Ctrl+C. To copy specific elements: left-click the element you want to copy, then press Ctrl+C.

Open a new or existing page in your Confluence space and press Ctrl+V to paste.

Publish your Confluence page.

View the published element(s). If needed, you can change elements in Edit mode - just click on the element and then click the pencil icon.