How to change image size in single portfolio page

Default in single portfolio, image size is 1170x700 (width x height) with 'Big image slide' layout and 750x450 with 'Small image slide). If you want display image size origin or change image size in single portfolio for your site, please do follow:

• Log into your WordPress admin panel.
• Navigate to FAT Portfolio » Settings.
• Click 'Single Setting' tab
• Push with and height into 'Big slide image size:' if use 'Big image slide' layout. Set empty to display image size origin
• Push with and height into 'Small slide image size:' if use 'Small image slide' layout. Set empty to display image size origin
• Click Save to save change