Layouts
Each of your document has a layout, that can be shared between documents when enabled via "instances" in the layout editor.
You create a layout when creating a new document, click "New Document" on the sidebar to create a document with a new layout.
To edit a layout, go to a document and click the edit layout button in the top right of the page. When the layout is instanced you can click on the edit layout button in the sidebar, too.
If you use an instanced layout, you can rename the layout in the layout editor.
To add visual structure to your layout, add a divider. You can select between blank space or a line, add a caption or add a text block for additional static information or explanations.