How to customise the arrows
If you wish to change the appearance of the connecting arrows, it is very easy to do so.
In Preview mode, head over to Design. There, you’ll be able to change the colour of the arrows.
Also customisable is the colour of the highlight effect being displayed on hover.
Regarding the width of the arrows, you can customise that by heading over to Data & arrows and increasing or decreasing the Arrow scale value.