Delete

On the Structural Ribbons tab, in the Modify group: Click Delete to delete discs and lineations from the displayed data.

The cursor will change to a cross and you can click a point.

The point you clicked on the ribbon will be deleted:

Points you click will be deleted until the Delete tool is inactive. To deactivate the Delete tool, click the icon to toggle it off.

If you have accidentally deleted a point from the display, the standard Undo (CTRL + Z) feature can be applied.

You can add ribbons to the data using the methods outlined in Add Ribbon.