I mean not floating sections.

Apparently you can do that to tableviews by using this code

let dummyViewHeight = CGFloat(40)
self.tableView.tableHeaderView = UIView(frame: CGRect(x: 0, y: 0, width: self.tableView.bounds.size.width, height: dummyViewHeight))
self.tableView.contentInset = UIEdgeInsets(top: -dummyViewHeight, left: 0, bottom: 0, right: 0)

Any ideas for SwiftUI?

Thanks in advance.

By scroll like normal do you mean that they are basically rows with different backrounds and fonts etc? You could fairly easily roll your own on that.

Yes but that would be a hack, and no so beautiful. I mean, I would like them to continue to be sections but to be fixed in place, like titles for the rows of their sections, without floating and hanging at the top.

Whats hacky about it? Section is defined as

public struct Section<Parent, Content, Footer> {

which means you have to supply the internal content youself and SwiftUI will make sure the section floats, or be collapsable. So you provide your own UI either way.