Widget availability is role-based and is determined by EEM WidgetAccess policy.
Verify if you have the 'MonitoringJobs' action flag set for this particular person or group.
Secondly, the option to 'Add' and 'Remove' widgets is determined by EEM ConfigurationControl policy and in particular by ConfigurationControlWidgets policy.
Verify if you have the 'Create' and 'Delete' action flag set for resource 'Widget/*'.
Login into WCC and click on the 'arrow down' icon on the Dashboard tab and it will give you a list of available widgets.
Select from the list now 'Jobs'.
The 'Jobs' widget will be added onto the Dashboard. You can now configure the Jobs widget.