To close all modules for your excitations calculation at once, use the Close command from the SCM menu:
Select 'Close' from the 'SCM' menu
Close will close all open modules that have your current job loaded, except ADFjobs. The Close All command will close every ADF-GUI module, including ADFjobs:
Select 'Close All' from the 'SCM' menu
All ADF-GUI modules (and BAND-GUI modules if any) should be closed.