Here Header is fill container and elements inside are also behave with size.
All the other sections aligns with header with same responsive style.
Still why the white space in present mode??
Structure as below :
Homepage [Top Most Frame - width : 1920px - proto - responsive]
Header [width - fill container]
Section [width - fill container]
… same as above [no section is larger than header]
Why homepage frame (top most / parent frame) has white space to it’s right in proto (present mode) - no device??
Please recheck that scaliing is set to responsive. If it’s responsive, shouldn’t homepage resize to the viewport available? Coz inner frames ‘header’, ‘section’ did became responsive to viewport.