Hi Doublezer0,
Spline Components become uneditable by the visualizer, when they have been initialized by the construction script, for consistency with other types of properties. You’ll notice that if a construction script changes any property of a Blueprint component, that property is then greyed out in the details panel. The same is true of the Spline Component - if you have a construction script which is initializing the points itself, they cannot then be changed by the visualizer. Essentially the construction script has the ‘last word’ on the initialization of the spline, or indeed any component property.
What is your construction script doing and why do you wish to override it with the visualizer?