You can save material to the Material Library just by dragging the material from Standart or Slate Material Editor
directly to the Material Library that opened in the Project Manager:
Or save material to the Material Library using Copy/Paste method:
![Copy/Paste Material](https://3d-kstudio.com/wp-content/uploads/2022/08/Copy-Paste-Material.png)
Also you can use the buttons on the panel
![Save Materials from Selection and from Material Editor](https://3d-kstudio.com/wp-content/uploads/2022/08/Save-Materials-from-Selection-and-from-Material-Editor.png)