Object
Here you can select the type of spline geometry you like to create. All options are also available as individual "Geometry Primitive" Nodes and offer the same settings. There you can also find details regarding each shape and its settings.
Here you can find all the specific settings for the chosen type. Have a look at the Nodes inside the "Geometry Primitive" group for a more specific description of the available shape options.
If the chosen shape offers a rounding option, you can activate it here.
If Rounding is available, choose the size of the rounding here.
Here you can toggle in which of the three planes the spline shape is created.
Enabling this option will reverse the point order of the spline.