I'm looking at using Simple Search for the first time. After you search, you can open a filter pane on the left side. Can I change which system properties show up here? Some of them will only confuse our users, like Class, Last Modified, etc. I've tried settings these properties as hidden in the repository's search settings, but it doesn't seem to affect these filters.

By design, the default filters can't be hidden using the repository's search settings (default filters: Class, Modified By, Modified On, Added By, Added On, File Type, and Size). Users can choose to exclude them from the filters pane (left pane) by removing them in the "Select filters" dialog.