Folder tabs can display color accents along their edges to help you identify specific folders.

You can configure this for specific folders or use a wildcard to match multiple paths. When you add a folder to the list (or select one that's already listed), use the Edge color field at the bottom to set its color. You can also click on the color preview shown in the list to edit it directly.

The Apply settings to all sub-folders option applies the same color to all sub-folders of the selected folder, unless overridden by another entry in the list.