Adding data points to excel project timeline

[David Margolis]

I am building a project timeline in excel.  The line chart with markers will only show 9 data points at one time.  There is a scrollable timeline and when I scroll over the other data points will appear even though they should all appear on both date ranges when I scroll.  Is there a way to show more?

 There is more info in the post below. 

Please help me.  I have been working on this for hours.

[#2]

You can see from the images that when you scroll the other data points appear but the chart will only show 9 data points at one time and I cannot figure out a way to show more.  In the first image - "Project End" should show up on the chart but does not.