Hello,
The "Enable Metadata generation" option should be set to Yes, in order for the other options on this tab to work. However, the Enable metadata generation does not generate any metadata automatically, this is done on per-extension level - in Manage Extensions, open the parameters for Content extension (for example) and there is a "Meta Tags" tab where you can disable the automatic metadata generation for the particular extension.
I know the names are confusing, we'll try to do something about it.
Best regards,
ARTIO Support Team