@Ched Dayot :

Yes, it does:

Michael

@Ched Dayot - But Shapes, no. But you can combine a left and right arrow:

Thanks @Robert Johnson :)

Not sure if this is what you are talking about, but hopefully it helps!  I frequently need to use double-headed arrows when connecting two elements when showing relationships.  If this is what you need, you can create a line or single arrowhead connecting the two elements, then click this on the line settings modal that pops up:
 

Clicking “None” will offer a dialogue showing various arrowheads to display on the left end of the line.  Same if you click the arrowhead to the right of my blue circle.

 

If someone at Miro sees this, I STRONGLY think it should show a grayed out arrowhead or something other than “None”.  I use this fairly often and still have days where I struggle remember how to do it bc “None” is not intuitive to show an arrowhead is available for that end of the line.