Disable PHPStorm new file branding

settings > editor > file and code templates > includes(tab) > php file header

I recommend to erase content instead of deleting this element

Windows: Go to File -> Settings -> Editor -> File and Code Templates -> Includes (TAB) -> PHP File Header

Mac: Go to PhpStorm -> Preferences -> Editor -> File and Code Templates -> Includes (TAB) -> PHP File Header

And then you can edit it or remove it, or whatever you wanna do :)