“How Do I Hide the Blue Bullets for Cells that Can’t Expand?”
 
Choose View → Cell Controls to hide or show the cell controls on a page.


Cell controls are the blue triangles and bullets at the left of every cell.  You can set a page to hide them .
Use the Page Format Inspector to hide the cell controls of empty cells, or cells with no children.


The Page Format Inspector contains settings for hiding cell controls .

Open the Page Format Inspector for me.