When we click in the Search area , choose Go to Issues - this should return all issues
it has a sub filter set on a date range
I cannot see how this has been set / overridden
Welcome to the Atlassian Community!
What exactly do you mean by "search area"? The only place that has a "sub-filter" is a Kanban board's configuration settings, which isn't a search thing. So I'm not understanding what you are looking at.