I don't think what it is a limitation in trial version.
I have observed that in a Vuforia Experience Service On-Premise.
It might be due the Project itslef.
- If you are in mobile, only Projects for mobile will be listed. It is similar with other platforms of course.
- If Projects have a ThingMark to open it, (defined in PROJECT panel, in CONFIGURATION section, in Experiences menu) it might be not listed in Library.
- Also check if Projects are public or with an authentication
- Do you have a Project who doesn't respect this ?