| 0x0030 | 0x48 | padding / unreflected |
| 0x08 | Properties | UMeshTopologySelectionMechanicProperties* | 6 flags | nullptr |
| 0x0080 | 0x50 | padding / unreflected |
| 0x08 | HoverBehavior | UMouseHoverBehavior* | Protected+6 flags | nullptr |
| 0x08 | ClickOrDragBehavior | USingleClickOrDragInputBehavior* | Protected+6 flags | nullptr |
| 0x08 | MarqueeMechanic | URectangleMarqueeMechanic* | Protected+6 flags | nullptr |
| 0x04 | MarqueeSelectionUpdateType | EMarqueeSelectionUpdateType | Protected+5 flags | OnDrag |
| 0x00EC | 0x5B4 | padding / unreflected |
| 0x08 | PreviewGeometryActor | APreviewGeometryActor* | Protected+6 flags | nullptr |
| 0x08 | DrawnTriangleSetComponent | UTriangleSetComponent* | Protected+8 flags | nullptr |
| 0x06B0 | 0x50 | padding / unreflected |
| 0x08 | HighlightedFaceMaterial | UMaterialInterface* | Protected+6 flags | nullptr |
| 0x0708 | 0x3D8 | unreflected bytes to end of UMeshTopologySelectionMechanic |