Adobe Audition - disable XMP metadata files

I can't seem to find a way to disable the creation of XMP files when I edit a .flac file in Adobe Audition 13.0.9.41 (Mac Os).

• If I hit Save as... I can uncheck the option for metadata.
• If I just open a flac file and hit Save, I don't get a Save dialog.

But what I want is to uncheck this globally for Save operations.

Please help me to find a way to disable this .. 😉