Oh, forgot to add. If you want to create a blueprint out of it, need to make a new blueprint, return to the viewport, select a new actor, in details there will be spline component. Click and hold it with mouse button and drag into the tab with blueprint, then release on the DefaultSceneRoot, select “attach” when asked. To be able to edit the points, change Reparam Steps Per Segment to 4 and back to 10, as described in the original post.