How to Hide the "CodeMirror Blocks" Admin Menu

function plt_hide_wp_codemirror_block_menus() {
	//Hide the "CodeMirror Blocks" menu.
	remove_menu_page('wpcm-options');
}

add_action('admin_menu', 'plt_hide_wp_codemirror_block_menus', 11);

Where do I put this code?