As a child of the Main Canvas, create a new panel named Content with a solid white background, we will give it a vertical layout, where any child UI elements are arranged in a stack from the top of the panel and expand down.
- In Hierarchy, select Main Canvas and right-click to create UI | Panel and name it Content.
- Set the Anchor Presets to Top/Stretch, then Shift+Click to set its Pivot point also at the top, and, finally, Alt+click to position it there.
- Set its Height to 750.
- Set its Pos Y to -50 to leave room for the Nav bar.
- Stylize the panel as transparent.
- Set its Source Image to none (using the doughnut icon, or press Delete).
- Set its Color to white and Alpha to 255 so it is opaque white (#FFFFFFFF).