Flowchart Maker supports all the flowchart shapes defined by Excel.
To find these shapes inside Excel, go to Excel’s Insert ribbon tab, in the Illustrations group there are 28 items in the Flowchart section.
Excel defines 3 types of connectors: Straight, Elbow and Curve.
You can choose connector type before creating a diagram. To do this, go to the "Flowchart" ribbon tab, from the "Connect Type" list, choose the connector type you want. "Auto" means if two blocks are on the same axis, then it uses straight connector, otherwise it uses curve connector.
Decision labels are annotations added to connectors. They are usually added to connectors originating from a decision block to explain different decision paths.
The app allows you to add the labels to other connectors too, but this is not a common practice.