import SwiftUI

struct ContentView: View { @State var courseCategoryList = ["SwiftUI", "Swift", "Machine Learning", "UIKit", "IOS", "ARKit"] @State private var selectedItem = Set<UUID>()

var body: some View {
    NavigationView {

        List(courseCategoryList, id: \.self, selection: $selectedItem) { category in
            Text(category)
                .font(.title3)
                .listRowBackground(RoundedRectangle(cornerRadius: 10).fill(Color.orange.opacity(0.2)))
        }

// .disabled(courseCategoryList.isEmpty) .navigationTitle("Dev Techie") .toolbar { EditButton() } } } func removeItem(at indexSet: IndexSet) { courseCategoryList.remove(atOffsets: indexSet) } }

You are not asking Edit to do anything, so it is efficient and does nothing. You need to have something for Edit to do, for example .onMove or .onDelete. However adding these to your List(…) call will cause an error, as that is not a RandomAccessCollection, just a list type.

List(courseCategoryList, id: \.self, selection: $selectedItem) { category in
    Text(category)
        .font(.title3)
        .listRowBackground(RoundedRectangle(cornerRadius: 10).fill(Color.orange.opacity(0.2)))
}
.onDelete { courseCategoryList.remove(atOffsets: $0) }
.onMove { courseCategoryList.move(fromOffsets: $0, toOffset: $1) }
// .disabled(courseCategoryList.isEmpty)
.navigationTitle("Dev Techie")
.toolbar { EditButton() }

will fail to build

Try this instead.

List {
    ForEach(courseCategoryList, id: \.self) { category in
        Text(category)
            .font(.title3)
            .listRowBackground(RoundedRectangle(cornerRadius: 10).fill(Color.orange.opacity(0.2)))
    }
    .onDelete { courseCategoryList.remove(atOffsets: $0) }
    .onMove { courseCategoryList.move(fromOffsets: $0, toOffset: $1) }
}
.navigationTitle("Dev Techie")
.toolbar { EditButton() }

If you omit both the .onDelete and .onMove then pressing the Edit button will again do nothing.