I see now that text stays editable until it is deselected. The cross arrow handle lets you reposition the text and font, size, and color can all be changed as long as the text has not been deselected. Once it is deselected it is flattened into its layer. Putting text in its own layer will make it easier to replace it later.
A line/curve can also be edited until it is deselected. A line/curve stays selected after it is drawn and color, dash, brush width, and fill can all be changed until the line/curve is deselected.
Other drawing shapes cannot be edited, so the properties (color, fill, brush width, etc.) must be set correctly before drawing.