When you compile into MOBI or EPUB… the name of the file is the name of your book. So make sure to rename your file to match tittle…
I am doing dry runs on that, but that is already a lesson learned.
I can see the embarrassment otherwise.
This is changeable though, so you don’t have to rename the project file itself. If you’re using a project template that automatically fills in the title for you in a title page or such, using the file name, you can just replace that text within the document itself. At compile time, you can adjust the title under the “Meta-Data” section (under “All Options” in the Mac version and in the expanded view on Windows, visible by clicking the down-pointing blue arrow to the right of the “Format As” pop-up menu). In the Mac version you can also adjust the project properties meta-data from Project > Meta-Data to determine what text will be used to replace various meta-data variables that you might use throughout the project or compile settings (e.g. <$projecttitle>).