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.
Then click over the little grey arrow under Derived data
section and select your project folder to delete it.