If you want the system to ask each time which of the two apps to use for opening a supported URL, adjust the permissions for both apps:
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Open the Settings app on your device.
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Tap Apps (or Apps & Notifications).
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Find your Form.com / Form.com Classic app, tap it and go to the App Settings section.
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Tap on Set as default, and in the screen that opens, set the Go to supported URLs parameter to 'Always ask'.
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Make sure that you do this for both Form.com apps installed.
If you want to use one of the two apps at all times:
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Open the Settings app on your device.
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Tap Apps (or Apps & Notifications).
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Find your Form.com / Form.com Classic app, tap it and go to the App Settings section.
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Tap on Set as default, and in the screen that opens, set the Go to supported URLs parameter to 'In this app' (this app will be your default).
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Go to the Set as default app setting in the second app, and set the Go to supported URLs parameter to 'In other app'.