Object Export Options

This menu is an individual override to the global object/image export option in the EPUB export menu. It is very complex and only needed when you have a wide variety of images in a document that need to be fine-tuned for optimal EPUB export. I'd recommend not using it, but staying with the global options under EPUB Export | Object instead.

Following up on your last issue, you should not be needing to use an image for that page title, not if you have the font. Correct settings for the style should give you the results you want without the downside of putting text in image format.

There is no reason you should not be able to center this text using the Paragraph Style. Getting it to space down from the top is tricky in EPUB but as the first element on the first page, top spacing should be respected. (Getting it to be precisely in the middle is complex to the point of not being worthwhile; you have to select a top spacing that is appropriate on a variety of readers and virtual page sizes.)