Remove games from origin list

I'm not familiar with a way to actually remove the game from Origin, but there is a way to hide the game from actually appearing in Origin. Open the file

C:\ProgramData\Origin\InstalledGames.xml

The Battlefield Beta has an ID of 71171. Find that line and change

hidden="0" to hidden="1"

I'm not quite sure what the ID for the alpha is, but you could just follow a similar process to remove that one as well.

You need to contact EA support. They will disable whichever games you want.

Note that in order to remove a game from your EA Origin account you MUST call the phone support.

It does NOT work if you contact them via email, web form or online chat - they will either do nothing at all or they will tell you to contact the phone support. It is only possible by directly speaking to a person!