Reply To: Modify Comment area layout

[Tom]

What version of GeneratePress are you using? The hook has been there for a while.

Might be worth trying one of the other options on the Adding PHP page other than Simple PHP.

Documentation: http://docs.generatepress.com/
Adding CSS: http://docs.generatepress.com/article/adding-css/
Ongoing Development: https://generatepress.com/ongoing-development