Changing a parameter value in Workbench does not immediately send the change to all active editors. Instead, those applications that are affected by the change will set their cell state to Refresh Required. If the cell’s state is already Update Required, then it will remain that way. Upon regaining focus, the DesignModeler application's editor will then inform you that upstream data has changed, and prompt them to refresh input data with a dialog box:

Clicking Yes to the dialog will import the latest parameter values from Workbench, along with any upstream input data that has not been consumed. Choosing No, will not update parameters in the DesignModeler application's editor, but the cell state in the schematic will remain as Refresh Required until a refresh is performed in the application.