Configuring preferences and options in Outlook.com
Some have a problem with the line going "into the past", which I personally am not against. It helps to see what the time is along the vertical axis.
That said, I would prefer in the current date to see an arrow on both sides pointing inwards with a line between the two. Ideally, this line would not be drawn using pixel size because of the high resolution on many monitors vs low resolution. 1 mm thick is likely thick enough... maybe 0.5 mm.
I also found this thread looking for a way to alter the appearance as I also find the node difficult to see and track.