A swatch library is a collection of swatches that you save in a file. The Swatches section displays a single library at a time.
To save a swatch:
Drag and drop swatches to change their order. Right-click a swatch to move it to the top, replace it, rename it, or delete it. You can also delete a swatch by Alt/Option-clicking it.
Use the drop-down menu in Swatches to:
By default, Unity saves swatch libraries in your user preferences. You can also save a swatch library in your Project. Unity saves Project swatch libraries in the Editor folder of the Assets folder. To share Project swatch libraries between users, or to include them in a package, add them to a revision control repository.
To edit a Project swatch library: