Oppo goes to a next level in spamming stuff we don't need by their Hot Apps shortcut on Homescreen.
And it is not always available in a new phone but comes after few hours sometimes days of usage.
To disable this icon/folder/shortcut follow the steps below.
1. Open Settings.
Swipe down the notification bar and open settings.
2. Open OPPO AppStore settings.
Scroll all the way down and click OPPO AppStore.
That's it. You can also disable notification alert from App Store and Browser for even better Android experience as these apps spam a lot.