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.