Airi health coach theme header issue & how to make page one column

I am using the Health Coach demo and so far, only 2 issues: Somehow I messed up the header photo that had text boxes on it and can’t re-create it and can’t change the text color in the header box and second, I would like to make the page one column and remove column 2. Can anyone assist me with this? Please see screenshot. Thank you!

Hello there,

There should only be a single section with this layout setting.

Then create a single column inside it. And insert title and subtitle.