这里有一个解决一些问题的建议。

• 将Label左对齐.frame(..)，.infinity将使所有标签占据整个侧边栏的空间。
• Label颜色.primary
• 为label给予一点填充
• label颜色.secondary
• 在底部使用Spacer稳定动画

import SwiftUI

  struct SidebarView: View {
  @State private var companiesExpanded = true

  var body: some View {
      VStack {
          DisclosureGroup(isExpanded: $companiesExpanded) {
              NavigationLink(destination: CompaniesLibraryView()) {
                  Label("Water", systemImage: "drop")
                      .foregroundColor(.primary)
                      .frame(maxWidth: .infinity, alignment: .leading)
              }
              NavigationLink(destination: CompaniesLibraryView()) {
                  Label("Sewage", systemImage: "star")
                      .foregroundColor(.primary)
                      .frame(maxWidth: .infinity, alignment: .leading)
              }
              NavigationLink(destination: CompaniesLibraryView()) {
                  Label("Electricity", systemImage: "bolt")
                      .foregroundColor(.primary)
                      .frame(maxWidth: .infinity, alignment: .leading)
              }
          } label: {
              Text("Companies")
                  .font(.subheadline)
                  .fontWeight(.semibold)
                  .foregroundColor(.secondary)
                  .padding(5)
          }
      }
      Spacer()
  }
  }

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您可以使用自定义DisclosureGroupStyle进行更多控制。
举例来说：How to make a custom DisclosureGroup (drop down) in SwiftUI?的

通过将.frame与alignment: .top添加到DisclosureGroup()，DisclosureGroup()将始终被推到顶部，并且在关闭后不会再次居中。

struct SidebarView: View {
    @State private var companiesExpanded = false
    
    var body: some View {
        VStack{
            DisclosureGroup(isExpanded: $companiesExpanded) {
                NavigationLink(destination: CompaniesLibraryView()) {
                    Label("Water", systemImage: "drop")
                }
                NavigationLink(destination: CompaniesLibraryView()) {
                    Label("Sewage", systemImage: "toilet")
                }
                NavigationLink(destination: CompaniesLibraryView()) {
                    Label("Electricity", systemImage: "bolt")
                }
            } label: {
                Text("Companies")
                    .font(.subheadline)
                    .fontWeight(.semibold)
            }
            .frame(height: 100, alignment: .top) // Push DisclosureGroup() to the top
            .background(.gray) // To see frame
        }
    }
}

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