I know it is an old topic, but I really like Space Oddity theme and I cant disable OMXplayer, so I changed some values at the theme file and this was the result:
WhatsApp Image 2019-05-20 at 18.12.25.jpeg

I changed pos and origin values, and replaced maxSize for size. You can see the file and change it by yourself, or just download and overwrite it

Changes:
Screenshot_1.png

Link:
https://github.com/Ephastus/space-oddity-theme.xml-OMX-Fix-

Sorry, this isn’t my first language, feel free to correct me.