The theme you are using crops uploaded pictures, but there is always a version of the picture which keeps the original full size. Modify the code that render the picture that it will use the size parameter.
Eg:
Use: wp_get_attachment_image:
echo wp_get_attachment_image( $attachment->ID, 'full' );
Or: display post_thumbnail:
echo get_the_post_thumbnail( $post->ID, 'full' );
'full' here means the full size
More: https://codex.wordpress.org/Function_Reference/wp_get_attachment_image
https://codex.wordpress.org/Function_Reference/get_the_post_thumbnail
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