For years I've been dealing this long issue long enough. I can't see the center of a circle
Basically, the axis of center circumference color has been set with a default as well as the size.
Is not a visual-friendly idea.
but to be honest, for most SE users for the last 20 years it seems to be still enough center symbol for any circle and arc.
BTW, YOu never ever need to sse it anyway, simply press the "C" button when hoovering over an arc with the mous to select the center point.
Doing so, it even isn't necessary to see that center point on screen, but You can select it and use it.