PolyLine source points can't be changed manually in the GUI
- run ParaView
- Sources -> PolyLine Source
- Points location can be edited be on validation, the value is reseted
A workaround is to use python with
p = GetActiveSource()
p.Points = [0.0, 1.0, 0.0, 1.0, 0.0, 0.0]
5.8.0 and master.