how i delete all my games

[Nachoelgamerfriki]

Ah Hello I Put All My Nintendo 64 Games But In An Accidental Way I Put All My Games In Nes Category So When I Search the Metadata It Doesnt Exist Nothing 

But it Doesn,t Matter How Much I Uninstall And Reinstall The Game Library Doesn,t Delete I Want To Fix This To Be Able To Delete All The Games And Back To Put In Again On The Nintendo 64 Category

I Have Launchbox 11.2