Hello,
Can you explain your workflow a little more here?
Any of the tool libraries under "Samples" or "Vendors" in your attached picture can't be modified, as those are read only libraries with some tools to help you get started.
In order to make modifications to your own tools/libraries, you should add a library to either the "Local" folder, or the Cloud folder (has to be enabled by going to <Username>->Preferences->General->CAM->Enable Cloud Libraries). You can also make modifications to tools in your associated "Document Library" which is what Untitled is in your picture.
You can't rename the document libraries, because those are specifically based on the design files you have open. However, you can add and edit tools from your document library by using the +tool buttons in the top right.
To add a new library to the Cloud or Local grouping, click on either "Cloud" or "Local" and press the +library button in the top left.
Let me know if you need more help getting up and running with the Tool Library - noah.balsmeyer@autodesk.com
Thanks,
Noah
Noah Balsmeyer
Fusion Mfg Software Engineer