I am following the video tutorials provided by Coffeecup and in step 8 "Responsify" I am at an impasse. She shows at the 2minutes 28 second mark that by changing the nav-wrapper to flex, center justify, she can slide between breakpoints and the nav-buttons will wrap vertically when small and side by side when large.
When I set my layout for the nav-wrapper to flex, and center justify, my nav buttons stay side by side and do not go back to stacking vertically on smaller screen. I cannot seem to mimic the behavior and I have recreated the project twice with identical results.

Hi set the flexed container to wrap, that should do it. Which navigation component are you using?

The other things to look at
1/ make sure you have selected "DEFAULT MODE" in the toggle breakpoints tab

2/ move your slider to the left of your lowest breakpoint, select the nav-wrapper container and set the flex to "column" then move your slider to just past the first BLUE (default) breakpoint, and set the container nav-wrapper to flex=row etc.