BuddyPress.org

Hi,

your site is pwd protected, so i removed the link to it.

You can do that by CSS from within your child-theme style.css
As it is not only BuddyPress css, but also dependent of your theme, you have to check for the correct classes and id’s to use.

1) we hide first the sidebar on the profile.
2) we enlarge the content part to full width (100%)

On each BP page is a page-id-{number}. You need it to define the style for this page only.

As example, this is working with Twenty Sixteen

/* remove sidebar */
body.page-id-0 aside#secondary {
	display: none;
}

/* enlarge content to full width */
body.page-id-0 div#primary{
	background-color: yellow;
	width: 100%!important;
}