1. Go to Preferences –> Images in the admin section:
    Screenshot_1
  2. You can see images for different sections and their dimensions:
  3. Click on the image name. Change Width and Height. …
    Screenshot_2
  4. Click on Regenerate thumbnails in order to regenerate images:
    Screenshot_3n
  5. Clear browser cache and cookies, clear PrestaShop cache and refresh the page.

 

If you want to buy amazing prestashop theme visit our themeforest themes. click here