Click the gear icon
Click Setup
Search "Object Manager"
Click Object Manager
Search "Intake"
Click Intake Form
Click Page Layouts
Click a page layout
Click "Save As"
Enter "Page Layout Name"
Click Save
Add new Sections by dragging the Section widget to the layout.
Remove Sections or Fields by dragging them to the Layout Editor at the top.
Preview the layout by clicking "Quick Save" first and then "Preview As"->System Administrator
When done with editing, click "Save" in the layout editor.