There is no setting for it since it is always turned on. You are either
using a TigerVNC viewer together with an FLTK that doesn't support
setting cursors, or there is some issue with the VNC server you are
using.
What versions of the viewer and server are you using, and who did the
builds?
Rgds
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A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?