When you edit a fillet using Edit
Feature, the Fillet PropertyManager
appears with no toggle buttons.The FilletXpert PropertyManager appears when you click FilletXpert in the Fillet PropertyManager. The FilletXpert can create and edit constant radius fillets only. Use the Add tab to create new constant radius fillets. The PropertyManager remembers its last used state.
Two PropertyManager toggle buttons are available:
Manual. Use this PropertyManager to maintain control at the feature level.
FilletXpert (Constant radius fillets only). Use this PropertyManager when you want the SolidWorks software to manage the structure of the underlying features.
When you edit a fillet using Edit
Feature, the Fillet PropertyManager
appears with no toggle buttons.
Edges,
Faces, Features and Loops 
. Select entities to fillet
in the graphics area.
Radius
. Sets the fillet radius.
Select through faces. Enables selection of hidden edges while in shaded or HLR display modes.
Tangent
propagation. Extends the fillet to all edges that are tangent to
the selected edge. 
Full preview. Displays a fillet preview of all edges.
Partial preview. Displays a fillet preview of one edge only. Press the A key to view each fillet preview in turn.
No preview. Improves display time with complex fillets.