With regards to the XMP files: Yes, there is a way of hiding them (view->disable 'Show Unknown files as proxies'), but I would recommend looking into why those XMP files exist. Generally, an XMP file will be paired up with a RAW file by matching up the two files with the same base filename, and when this happens, Photo Mechanic knows not to show it on the Contact Sheet (regardess of what 'Show unknown files as proxies' is set to). But if there is no RAW file in the folder to pair up that XMP file with, then Photo Mechanic will consider it an "unknown file" and show the placeholder proxy that you are seeing. Generally the reasons for seeing these files on the Contact Sheet are: RAW files were removed from the folder without moving their accompanying XMP file, or some other software created XMP files for non-RAW files.