I created an empty map in Carto Builder. It contained an empty layer. When I selected that layer in the sidebar, a toolbar for adding points/lines/polygons appeared in the lower left of the map layer. I used that to add a point. So far so good.
Then I wanted to add a line. So I added an empty layer to my map, and selected it in the sidebar. But the toolbar for adding points/lines/polygons did not appear in the lower left of the map layer.
How do I add a point/line/polygon to a new empty layer in Builder?