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While you do not have uploaded all images in a fix size, until then you cannot stop all imags to be cropped. However we can increase the height of the image on single course page to 100px more or 200px more as well.
But this would require a customization into the theme. That would go away once you update the theme as well. If you want to do this.
Please edit theme file
wp-content >> themes >> education >> lib >> core_functions.php
and find this line on # 122
add_image_size("wc-single-course-thumb", 870, 350, true);Change height 350 to any number you think would work best for you. Once you have done this change in theme's file then you need to regenerate thumbnails use https://wordpress.org/plugins/regenerate-thumbnails/ plugin to regenerate the thumbnails.
WordPress crops and saves the cropped images into uploads/ directory that's why its important to regenrate thumbnails after changing the image size.
