dilne3

Thanks for your help. It turns out there was an invisible box around the the buttons that was very difficult to find where to click to edit it. In the settings for this box I was able to set the columns from 1 to 2 to 1 which reset the input field and subscribe button which meant they stretched to fill the width 100%, which was great.

But then I wanted the input field to be approx. 70% width and the button approx. 30% width (approx. to compensate for padding). To do this, there is an additional box surrounding the input field and subscribe button where the width can be set. It’s impossible to find this button exists unless you accidentally click it, it should be clearer!