Hi Carol,
If you want to change the slider height then it needs code customisation. Go to theme folder -> functions.php on line no 146
You will see this code
// Add Interface Pro custom image sizes
add_image_size( 'featured', 670, 300, true );
add_image_size( 'featured-medium', 230, 160, true );
add_image_size( 'slider-narrow', 1038, 500, true ); // used on Featured Slider on Homepage Header for narrow layout
add_image_size( 'slider-wide', 1440, 500, true ); // used on Featured Slider on Homepage Header for wide layout
add_image_size( 'gallery', 474, 342, true ); // used to show gallery all images
add_image_size( 'icon', 100, 100, true ); //used for icon on business layout
Change your slider size for narrow layout
add_image_size( 'slider-narrow', 1038, 500, true ); // used on Featured Slider on Homepage Header for narrow layout
Change your slider size for wide layout
add_image_size( 'slider-wide', 1440, 500, true ); // used on Featured Slider on Homepage Header for wide layout
here 1038 and 500 is for width and height
Thank you!