Describe the bug
Dear swharden,
I am using your Scottplot.Demo.Winform Demo, I noticed below points.
When Zoom out fully in PlotXY, it shows marker
But in Plotsignal full Zoom out there is no marker.

Screenshots
PlotXY Plot
When Zoom in fully, it shows marker

When zoomout fully it is also showing marker

PlotSignal
When Zoomin fully it shows marker

When Zoomout fully there is no marker

Thank you
Regards
GOBI.K