Existing legacy Adalo apps can now be copied as a new responsive app. This will bring over all your screens and components. You will find this option in the Copy App modal.
Important: Because each app's layout is unique, the copy of your app will not be properly responsive until you set it up correctly.
You will have to select each component in your app and apply the appropriate settings in the new Layout tab,
in addition to considering the unique layout you'd like for each screen size.
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If you would like help converting your existing app to responsive, consider contacting an Adalo Expert.