Layer over form elements problem?

Hi all,

I've noticed that form elements (textbox, button, etc...) are still visible even if there's a layer on top.

I wonder if there is no way to hide them but hiding the form layer...

Here is a test example

https://drive.google.com/file/d/1fc01AirBFKRxFrZZIHKw814JvQllcgKR/view?usp=sharing

Thanks in advance you for your help

Manual:

Form controls are actual HTML elements floating above the game canvas in the HTML page. Therefore, nothing can be displayed on top of a form control, apart from other form controls.

It makes sense now, thank you!