iTunes movie classification
In iTunes, Get Info on the specific video. From the Options tab, select Media Kind and change it to Movie or the appropriate format.

iTunes selects the Media Kind based on any metadata it can parse from the file. Lacking anything for .mp4 files, it defaults them to Home Video.

If you have movies ripped from DVD and want to add metadata, take a look at MetaZ. (It's the replacement for the old MetaX when that stopped being updated and functionality broke.) iTunes properly reads the metadata that MetaZ embeds. You will want to remove the files from iTunes, process with MetaZ and then re-import them into iTunes.