Display a swiftui progress view inside a nested navigation screen - swiftui

My app has a nested navigation as below
Landing View --> Child view 1 --> Nested Child view
What is the best way to show a progress view while a background download / upload is underway ?
Currently placing an overlay doesn't stop the user from navigating back as the overlay doesn't cover the navigation bar.
ZStack {
}.overlay(ProgressView())

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At some point, I want to change the root view controller of navigation controller to Second View and when clicking on a back button in Second View it moves to the first view with tab bar controller.
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I have created a new view ("form") in my Access Web App using the menu buttons to create a new view. The view is bound to a table in my database. Running Access on my computer, I can select the view from the navigation panel on the left.
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thanks for your help.
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