Each section sits beside a slim vertical rule, giving the page structure without boxes, bands or a sidebar for a parser to trip over.
This is a single-column design: every section runs the full width of the page, in the order a recruiter reads. That is the structure applicant tracking systems parse most reliably, because there are no side-by-side blocks for the parser to interleave.
It keeps standard section headings and selectable text, so it stays readable to parsers while giving you more visual character than the plain ATS layouts.