Took me a min to figure out that I needed to click the line button in the toolbar to actually draw line arrows between shapes.
Could possibly add a hover on outline of shape that lets you do the line function and a further out hover would allow you to do add a shape. Kinda combining your two current functionalities just spacing them out a little bit depending how it is built.
Ive used other user flow tools which this was super helpful in.
Regardless I love FigJam and glad I can keep everything in one place. I was discouraged from using user flows before because of the laziness of hoping to another software lol. Thank you soo much!!!