Hello @manos,
Thank you for your inquiry. Unfortunately, our theme does not have a specific option to address this issue. By default, WordPress generates different sizes of images for different resolutions.
We recommend that you read the following article for a better understanding of the issue and to learn how to fix it: https://www.wpbeginner.com/wp-tutorials/how-to-prevent-wordpress-from-generating-image-sizes/.
We hope this information is helpful.
Best Regards,
8Theme’s Team