Hi there
Thanks for posting your question in the Lucid Community! You can extend your page automatically by dragging an object into the grey area - or if you're using a template you can extend the page to become larger or smaller. This allows for the flexibility to alter the page to best visualize your work.
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When you go to export there are several settings you can choose from to still visualize your chart on the same singular page.
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If you'd like to extend your template onto a new page tab you can visit the Template Gallery to insert a new template - which will automatically form on a new tab - or you can copy and paste your current template onto a new tab.
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I hope this helps! Let us know about the ideas you come up with!