I'm used to Serif DrawPlus, so I tried drawing arrows with the pen tool before realising that the shape tool was suitable.
Unfortunately, it seems difficult to draw arrows consistently, particularly to get the arrow heads the same. So I can see that two arrows whose properties I have tried to match, don't. I know, I thought, I'll create a style! Tried that, can't see any confirmation that one has been created or any way of retrieving a saved one.
Harrumph!