To make the MiniWeb views more useful, you may select a set of file types to hide from the MiniWeb view. To select multiple types, use Ctrl-click or Command-click. When you press Apply, files with that file type will no longer be displayed in the miniweb view.
There are a set of standard file types (ie. "Image files", etc.) already provided for you. You may also hide files with specific MIME types (ie. type "image/gif" into the field above, press Add, and then press Apply. Gif files will be hidden, but jpeg files will remain visible).
You may also hide external files or files which are linked to but do not exist (ghost files).