使用DisclosureGroup似乎很困难，但您可以使用下面的自定义视图非常简单地复制类似类型的行为。这有点初级，但希望能为您提供一些想法和功能。您可以复制DisclosureGroup的外观和感觉，并在CustomDisclosure HStack中扩展chevron。需要注意的主要问题是，ZStack会尝试占用所有提供的空间，因此有时候如果有可用空间，折叠的行似乎会保持其展开后的大小。
我已经更新了自定义的DiscloseView，所以它现在把扩展的视图作为一个闭包，与DisclosureGroup、VStack等相同，所以你可以根据自己的喜好自定义扩展的视图。

import SwiftUI

struct CustomDisclosure<ExpandedView: View>: View {
var title: String
var contentView: () -> ExpandedView
@State var isExpanded: Bool = false

init(_ title: String , @ViewBuilder _ content: @escaping  () -> ExpandedView) {
    self.title = title
    self.contentView = content
}

var body: some View {
        Section {
            if isExpanded {
                contentView()
            }
        } header: {
            HStack {
                Text(title)
                    .foregroundColor(.blue)
                Spacer()
                Image(systemName: "chevron.right")
            }.onTapGesture {
                isExpanded.toggle()
            }
            .background(.white)
            .padding(.bottom , 12)

        }
}
}

struct ContentView: View {
    @State var test: NoReturn = NoReturn()
    
    var body: some View {
        ScrollView {
            LazyVStack(pinnedViews: .sectionHeaders) {
                ForEach(1..<20) { i in
                    CustomDisclosure("Test \(i)") {
                        Text(bigText)
                    }
                }
            }
        }
        .padding()
    }
    
    var bigText: String = "Big Amount of text \nBig Amount of text \nBig Amount of text \nBig Amount of text \nBig Amount of text \nBig Amount of text \nBig Amount of text \nBig Amount of text \nBig Amount of text \nBig Amount of text \nBig Amount of text \nBig Amount of text \nBig Amount of text \nBig Amount of text \nBig Amount of text \nBig Amount of text \nBig Amount of text \nBig Amount of text \nBig Amount of text \n"
}