To provide answers to your questions are as follows:
Asus laptop touchpad can be turned off by FN+F9, if it is invalid, you need to install two drivers, one is the shortcut key driver, and the other is the touchpad driver, please confirm the specific model of the machine, and the system version, and then go to the official website of the ASUS to download the download link is as follows:
/download/options.aspx?SLanguage=zh-cn