The Amazon Kindle/Mobi format is the proprietary eBook format used for the Amazon Kindle platform. Internally it is almost identical to ePUB, but it is packaged in a proprietary binary container instead of in a standard Zip archive like ePUB.
Since the actual format of Kindle/Mobi is so similar to ePUB, the two formats share the same basic settings. You can configure these settings in Project Explorer: Configuration > Publishing Options > eBooks.
See also: (ePUB suggestions and settings shared with Mobi)