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: https://youtu.be/qbtoPvZjaQ8 Or save material to the Material Library using Copy/Paste method: #image_1993173915 img { width: unset; } Also you can use the buttons on the panel #image_2088812911 img { width: unset; }