Server Manager exposes the ApplyToDoListRoleFilteringInWC setting found in the SPFAppServer.Config file to control the display of workflow tasks in the To Do List. By default, the setting value is True so that all workflow steps in the Web Client are filtered for each user, based on the selected roles.
<add key="ApplyToDoListRoleFilteringInWC" value="True" />
However, some customers may require the To Do List to show all available workflow tasks assigned to their users so they do not miss any task assignments. In that case, change the ApplyToDoListRoleFilteringInWC setting to False so that all available workflow steps are displayed in the To Do List, regardless of any selected roles.