This didn’t effect widescreen on my site where I have a bunch of other stuff going on that’s not included in the component you link to, but it did break my customization of desktop view so that it fits on mobile screens to allow user to use embedded replied to/replies on mobile devices. For whatever reason, position: sticky didn’t stick when the width was < 768px. No idea why sticky wouldn’t work so I ended up having to go with
@media (max-width: 767px) {
.d-header-wrap {
position: fixed;
top: 0;
width: 100%;
}
#main-outlet {
margin-top: 48px;
}
}