In contrast with the other libraries, the AquimaTheme library is a project instead of an external library project. The reason for this is that in some cases you need to be able to change the standard content styles to include your own content styles. If the AquimaTheme would be an external library project, this would not be possible because external library projects cannot be changed.

If you do not need to change the AquimaTheme project, you can convert it into an internal library project by editing the project and selecting the "Is library" checkbox.