You can decrease the height of the slider to make it smaller for the larger devices.
However, we would like to recommend you use the proper media query and CSS targeted specifically for larger screens as the CSS you are trying will run across regardless the screen size that might hamper the responsive layout of the theme.
Please use the following custom CSS targeted for the larger screens only to decrease the height of the slider only in the desktop screens without impact on other devices in your Admin Dashboard > Appearance > Customize > Additional CSS :
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