Select Freehand and Brush Tool (N)
Set line width to 4
Set arrowhead to the first one
Draw some arrows, not touching.
Disable Sketch Mode
Draw 3 more arrows, all starting at the same point but heading in different directions.
The 3rd arrow head will flip
Draw more arrows, not touching.
These will all be backwards.
Start a new document. Arrow will be the right way round again.