You may want to set different colors for your Folders, to help you more easily identify their purpose at a quick glance.
First, locate the Folder in the Library page or the Folders page.
Then, click the ellipses menu button on its right side (3 vertical dots):
Select the Change Color menu option:
Then pick one of the preset colors:
Then click the Save Folder Color button and the Folder's color will be updated: