If you are not able to see a library or all libraries, please check if you are invited to those libraries and that you have connected them to a guideline. It is only possible to see the library in the Desktop App, if the library has been connected to it.
You can check the following way if your library is connected:
Go to your library
Check on the left side if the guideline Icon appears as shown in the image below:
3. If the icon appears, it means the library is connected to a Guideline
4. If the icon does not appear, you can add the Library to a Guideline as described in the following article: Collect your Library to the Style Guide