Custom Search provides a very fine level of control when searching for fabrics. You would use this feature if you find a fabric that is close to what you are looking for, but you want to ignore certain colors, or emphasize others.
To use Custom Search, click on the link that appears just below the list of colors in a Fabric page:
If you are using a phone or another device whose window is not very wide, the colors might appear on a separate tab:
Custom Search is available even if you are not yet signed in. However, since Custom Search creates a Fabric and adds it to your My Stash, you must have free space available in your Stash. Custom Search is unavailable if the fabric you are browsing has only one or two colors.