The Xsheet view has three sections. By default, only the main section is visible. It displays the drawing layers, also known as drawing columns.
When using advanced compositing and animation techniques, unconnected functions (motion paths) also appear in the main section. Unconnected functions mean that some motion paths are not attached to any particular layer.
Refer to the topic Showing and Hiding Columns to learn how to temporarily hide unconnected functions from the main section.