Local Assets library an project space issue

Hi,

I wanted to create my own library with my objects and materials. I opened my last project and selected a location for the local assets directory under “Preference” → “Assets Storage” → “New Location”.
The library was created. There is currently only one material here (white wall texture). Otherwise no other objects in the local library.
However, the local directory on my hard drive is almost 9.5 GB in size and contains 1698 files in 712 directories.

It seems that not only the local assets are stored here but also all those that were used in the project. The project directory also contains several GBs of data. I think that the assets used are also stored here. This is a huge waste of storage space. Can you please separate this so that all assets used in a project are stored in the project directory and the local library separately? Thanks in advance.

Best regards