What does the Tangent Propagation option do when creating a Fillet?

The Tangent Propagation option when creating a fillet is particularly useful in scenarios where multiple edges are tangent to each other. When this option is enabled, it allows the fillet to automatically extend along the tangent edges connected to the initially selected edge. This means that if you apply a fillet to one edge, the system will recognize adjacent edges that are tangent to it and will apply the fillet to those edges as well. This feature streamlines the design process by reducing the amount of manual selection needed to create consistent fillets across complex geometries.

In contrast, the option that only applies a fillet to selected edges would not capture the tangent relationships, potentially leading to a less cohesive design. Ensuring uniformity in size pertains to the consistency of the fillet radius across multiple edges but does not account for the propagation of the fillet along tangent edges. Furthermore, while following edge curvature is important for maintaining aesthetic or functional design characteristics, it is not the primary function of the Tangent Propagation feature. This option is specifically about extending the fillet effect across connected, tangent edges, enhancing workflow efficiency in SolidWorks.