One way is to adjust the TinyMCE settings:
add_filter( 'tiny_mce_before_init', function( $settings ) {
$settings['height'] = '120';
$settings['autoresize_max_height'] = '120';
return $settings;
} );
and e.g. restrict further on post types and !block editor with get_current_screen().
Example:
add_filter( 'tiny_mce_before_init', function( $settings ) {
$screen = get_current_screen();
if ( $screen->is_block_editor() ) {
return $settings;
}
if ( ! in_array( $screen->post_type, ['tools', 'brand', 'company'], true ) ) {
return $settings;
}
$settings['height'] = '120';
$settings['autoresize_max_height'] = '120';
return $settings;
} );