Hi, for you to see the DUAL APP settings, you must first install any application that normally need DUAL (WhatsApp, Tik Tok, Viber) and at the end of the installation, when the phone finishes scaning the installed app you will notice "DUAL APP" option next to the "OPEN" button. Click it and it will take you to the "dual app settings" where you can enable/disable the app you want. After that it will disappear again :)