Create a variable of type “PrimitiveComponent” reference, make this an array.
Set this array in your construction script. Drag the entry pin of your “Set” node, type “Make Array”.
Plug each of the component you want to toggle the stencil of in the “Make Array” node. You can add entries in by right-clicking the node.
After that, you can loop through that array and activate / deactivate the stencil by dragging a wire out of the “ArrayElement” pin of the “ForEachLoop”.
Quote me if you want more details.