Hello,

You're welcome. Unfortunately, there is no predefined option for that, but you can try to add this css in Elated Options >> General >>Custom CSS field

  div.pp_pic_holder {
  top:50% !important;
transform: translateX(-50%) !important;
  }
  body div.pp_default .pp_content {
  width: 100% !important;
  height: auto !important;
  }
  .pp_hoverContainer {
  width: 100% !important;
  height: 100% !important;
  }
  div.pp_default .pp_details {
  width: 100% !Important;
  }
  .pp_content #pp_full_res>img {
  width: 100%!important;
  height: auto!important;
  }

Hello,

Such an option, unfortunately, does not exist within the theme, we are sorry. Achieving this will require some custom coding, but we are not in a position to accept any custom work, because we primarily need to focus on providing Theme Support to all customers. We hope you understand.

In case you are not familiar with programming, you could hire someone to do this for you. You could look for someone who you can hire for this kind of job at the following link: - http://studio.envato.com

Thanks for understanding.

Hello,

Unfortunately that is not a feature of the theme and while we do offer to perform small custom changes, this would require more than just a short fix. So it is something you would have to modify on your own or get a third party to help you with since we are unable to provide this level of customization to all of our customers. 

You can try to alter these files for PrettyPhoto gallery.

wp-content\plugins\js_composer\assets\lib\prettyphoto\css\prettyPhoto.min.css

wp-content\themes\ion\assets\js\modules\plugins\jquery.prettyPhoto.js

Sorry once again for any inconvenience and thanks for understanding.