Gridlines to Modern Access Charts
The 'modern' charts in MS Access no longer allows for gridlines to be set. The gridlines can be a great visual aid in charts to quickly access where the value plotted lies in relation to the axis. It was present in the 'old' charts but is no longer available in the 'modern' charts. I would also recommend adding scatter plots to the modern charts. Just FYI, your free/opensource counterparts have them already implemented within their packages.
Patrick C Simonds commented
I would agree. Gridlines are very important for the viewability of a chart.