My simple iOS app has a TabView within the ContentView containing three tabs: ProfileFormView, InvestFormView, EarningsView.

Here is the link to the GitHub repository.

My ContentView code is as follows:

TestApp
import SwiftUI

struct ContentView: View {
    @State private var tabSelection = 1

    var body: some View {
        TabView(selection: $tabSelection) {
            ProfileFormView(tabSelection: $tabSelection)
                .tabItem {
                    Image(systemName: "square.and.pencil")
                    Text("Profile")
                }
                .tag(1)
            InvestFormView(tabSelection: $tabSelection)
                .tabItem {
                    Image(systemName: "dollarsign")
                    Text("Invest")
                }
                .tag(2)
            EarningsView()
                .tabItem {
                    Image(systemName: "chart.line.uptrend.xyaxis")
                    Text("Results")
                }
                .tag(3)
        }
//        .tabViewStyle(PageTabViewStyle(indexDisplayMode: .never))
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

If I uncomment .tabViewStyle(PageTabViewStyle(indexDisplayMode: .never)), I gain the ability to swipe left and right to navigate between tabs BUT I lose the three tab icons at the bottom of the view and the view formatting is generally disorganized.

Any ideas how to gain swipe navigation ability while keeping the tab icons at the bottom?

You can make a custom one. Sorry if not perfect. Was made in Playgrounds on iPad. On it resembles native one.

struct ContentView: View {
    @State private var tabSelection = 1

    var body: some View {
        ZStack(alignment: .bottom) {
            TabView(selection: $tabSelection) {
                Text("View One")
                    .tag(1)
                Text("View Two")
                    .tag(2)
                Text("View Three")
                    .tag(3)
            }
            .tabViewStyle(.page(indexDisplayMode: .never))

            TabButtons(selectedTab: $tabSelection)
        }
    }
}

struct TabButtons: View {
    @Binding var selectedTab: Int

    var body: some View {
        HStack {
            Spacer()
            VStack(spacing: 5) {
                Image(systemName: "square.and.pencil")
                Text("Profile")
                    .font(.caption)
            }
            .onTapGesture {
                selectedTab = 1
            }
            .foregroundColor(selectedTab == 1 ? .blue : .gray)

            Spacer()
            VStack(spacing: 5) {
                Image(systemName: "dollarsign")
                Text("Invest")
                    .font(.caption)
            }
            .onTapGesture {
                selectedTab = 2
            }
            .foregroundColor(selectedTab == 2 ? .blue : .gray)

            Spacer()
            VStack(spacing: 5) {
                Image(systemName: "chart.line.uptrend.xyaxis")
                Text("Results")
                    .font(.caption)
            }
            .onTapGesture {
                selectedTab = 3
            }
            .foregroundColor(selectedTab == 3 ? .blue : .gray)
            Spacer()
        }
        .padding(.vertical)
        .background(
            Rectangle()
                .fill(.quaternary)
        )
    }
}

I was going to suggest that you look at Flashzilla to do with .gesture. But either way you can have the PageView OR TabView (then have a gesture swipe)