Thanks for letting us know you want to uninstall the Large Media add-on for your site. Would you please confirm you have read the following Support Guide?
If you have read that, would you please confirm you have backups of all files?
Also, would you confirm that this is the Large Media instance to remove?
Please let us know if there are any questions and, if you confirm we should proceed, we’ll uninstall the Large Media add-on for this site.