By default, Featured Images in Challenger display with a 2.5:1 aspect ratio. However, you can change this aspect ratio, or completely remove it.
- Visit the Customizer (Appearance → Customize)
- Click on the "Featured Image Size" section.
- If you want to use the default size of each Featured Image, switch the setting to "No"
- If you want to change the aspect ratio of the images, use the slider to decrease/increase the aspect ratio
- Click the Save & Publish button to save your changes
This setting will apply immediately to all Featured Images on the site.