The projects page seems to be disappeared from Xcode 8. I used this page for deleting the derived data.
Any idea how can I delete derived data from within Xcode 8?>
(Working in Xcode 11)
You can go to File > Workspace Settings if you are in a workspace environment or File > Project Settings for a regular project environment.
File
Workspace Settings
Project Settings
Then click over the little grey arrow under Derived data section and select your project folder to delete it.
Derived data