Hi,

By default, the sidebar for BuddyPress profiles will follow the sidebar for single post pages.

If you just want to remove sidebar for BuddyPress profiles, you can try add more this code to Customize > Custom CSS:

body.buddypress.single .penci-single-style-10 .penci-single-s10-content, 
body.buddypress.single .container.penci_sidebar #main{ width: 100%; float: none; padding-right: 0; }
body.buddypress.single .penci-sidebar-content{ display: none; }

Best Regards,

PenciDesign