How do i enable photos/images to cover entire width of page?

Hi everyone,

I'm currently helping my client work on her site using the Brine template, Squarespace version 7.0

She would like the top section of her Homepage to have a similar look as the top sections of the following reference sites below:
 

https://www.parsleyhealth.com/about-parsley/

https://www.marieforleo.com/

https://themovementboutique.ca/

My question is:

Can I upload & adjust photos/images to cover the entire width of the page using Squarespace's current features?

Or do I need to extra code to do that?

And if I need extra code, can anyone help me with that?

Under design/styles select full width. The banner/welcome image will size like this:

https://waterclinicfl.com/

ok.

but where can i find the "full width" option?

In the design/config control panel go to design/styles/site,  first option at the top is a pull down menu that controls width. Choices are full width, full background, constrained width. You might want to try them all just to see how they work. 

i see.

ok then, thanks for the info.