For functions with many parameters or if these are irrelevant in the current context, it can improve the overview if you can deactivate the display of function arguments for individual message widgets. STEPS TO REPRODUCE 1. start umbrello 2. add sequence diagram 3. add two objects 4. connect them with two different synchronous methods with method parameters 5. Open properties dialog for a selected method widget and try to hide the method parameter for this individual method OBSERVED RESULT There is no property dialog available to hide the method parameter for this individual method EXPECTED RESULT There should be a property dialog available to hide the method parameter for an individual method ADDITIONAL INFORMATION There is only an option to hide all operation signatures in the current sequence diagram