BookDesigner does not support MobiPocket TOC, so most BD-based books (e.g. from MobileRead) have an internal TOC near the start which does the same job.
Since it isn't a MobiPocket TOC, you can't use the TOC icon - however since the internal TOC is near the start of the book you can just go back to the start to access it again.
You can also read DRM-free MobiPocket books with FBReader. It also does not recognise the internal TOC as a formal TOC, but it has a goto-start icon and also a go-back icon. These should take you back to the internal TOC.
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