If it seems like one of your panels has disappeared, you have probably accidentally collapsed it or resized it. The Navigation Panel, Chart, and Insight panel can be collapsed by clicking on the triangle icon in the upper right of the title bar for the field. Click on the triangle icon to re-open the panel (see screenshot below). Additionally, all panels can be resized by dragging on their borders—you may have changed a panel size without realizing it. Drag on the missing panel’s edge to restore it to the size you want.
