@Override
    public boolean handleDefaultAction(DatabaseNavigatorTree tree) {
        if (getParent() instanceof DBNDatabaseNode dbNode) {
            NavigatorHandlerFilterConfig.configureFilters(tree.getShell(), dbNode);
        }
        return true;
    }
A special node that is shown when a filter is applied to a parent folder node.
plugins/org.jkiss.dbeaver.ui.navigator/src/org/jkiss/dbeaver/ui/navigator/database/load/TreeNodeFilterConfigurator.java