Connection Lines - be able to set alignment, i.e. ensure it is completely horizontal or vertical

Hi,

I am using the connection lines to create lines that are not connected to other objects.

I would like the lines to be completely horizonal or vertical however I am finding that I can only do so via the steadiness of my hand.  It would be great to be able to set the alignment of the line so that I know it is completely straight.

LOVE MIRO!