If you always want it to be this way then you'd probably do well to take a look at Nudel's HOW TO: Understand and Configure Folder Formats FAQ. Once you're familiar with using Folder Formats, you'll want to look at the 'Filters' tab in Folder Formats and add *.ii to the 'Hide Filter'...
Otherwise, you can add the new File Filter Field to a toolbar somewhere for 'on the fly filtering'. You can read more about that in the Opus 82 Changes.pdf located in the programs installation folder.