Why I am not seeing custom CSS option in the widget?

Hi, I'm using the Configurable List widget, it says that I should be able to edit the CSS of the fields as it's too wide. However, I can't see the option on my form.

Screenshot attached below

You are using card form which you can not inject any css code. If you want custom Css to be included , you need to change your form layout from card to classic.

Go settings -> Click show more -> Go to form layout -> All Questions in One Page ->Refresh page 

Than you can see CUSTOM CSS section

Okay great, Thank you.