See this discussion for details:
https://bugs.launchpad.net/inkscape/+bug/165865

Currently, you can use the workaround "Color markers to match stroke" extension in "Extension" -> "Modify path"

2009/3/19 Fantomas <fantomas1024@seznam.cz>
Hi,

why is it 'Draw freehand lines' 'Start Markers' and 'End Markers' only
the color black?
Markers should be the same color as the Line...
or wrong?

Thanks Martin

honor your work

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