Disable wp_enqueue_style for theme on wp-admin

There is a conditional tag is_admin() which checks are you in the Administration Panel or Frontend. So,

if( !is_admin() ) {
    wp_enqueue_style(
        'css-minified',
        get_stylesheet_directory_uri() . DIRECTORY_SEPARATOR . 'style.css',
        [],
        null,
        'all'
    );
    wp_enqueue_style(
        'font-awesome',
        'https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css',
        [],
        null,
        'all'
    );
}

See is_admin().