You can find this information in the help text when navigating to "Shared Components" -> "Component Settings" -> "FOEX Application Settings" and clicking on the help for state saving and caching.
You can clear the application state by performing the following:
( p_app_id => :APP_ID
You can clear the application cache using the following:
-- Clear the cache for the entire application across all users and sessions
(p_app_id => :APP_ID
COMMIT; -- optional
You can also find this information in the "Reference Documentation" which is the first card displayed when opening the Documentation application e.g.