Use the Templates feature to transfer a page from one project to another.
Open the 'Project menu' (shortcut M) by clicking the page number icon at the lower right corner and click the 'Templates' link. Choose the 'My templates' option from the dropdown menu. You will be prompted to create a template from whatever page you are currently viewing.
Note: If some widgets are global, you will see options to 'Include 'On all pages'' and 'Without 'On all pages'' when saving a page to your templates folder. The first option will save the template with all global widgets, the second will remove them from the template layout.
To add your newly created template to another project, open the project menu, click 'Templates' and choose the 'My templates' option: you will see a list of your custom templates. To choose one, simply click the associated preview. The page will automatically be added to your project.
Note: To change the page order, drag the preview of the desired page up or down.
To delete a page saved to your templates, hover over the associated preview and click the cross icon at the top right corner.