Location: Appearance → Customize → Content → Blog → Featured Image
The caption in a featured image refers to a short text that provides context or background information about the image. To add the caption to the image, refer to the guideline: How to add a caption to the image?
ColorMag theme displays the caption below the feature image in Blog/Category, Search, and Single Post pages. It comes with the following options: [Available in ColorMag Pro]
Switch the Toggle to the right area to enable the caption on your site. Enabling the option will display the caption below the featured image.