Thanks for your wellcome.
Exactly, I'm talking about Draft workbench
. Unfortunately, the page you indicate is not my doubt. I had already visited it and it doesn't indicate anything about what I want to get. What I want to appear is what you see in the following image:
In the video FreeCAD automatically detected the midpoint of the line and placed a white solid circle at that point. I don't get FreeCAD to do this. I think it must be something of the program configuration, but I can't find it. Where is it?