@JCB Try following this approach:
1. Add a button control on first screen
2. Assuming 2nd screen name is DetailsScreen. Try using below formulas in OnSelect property of button control:
Navigate(DetailsScreen)
OR
Navigate(DetailsScreen, ScreenTransition.Fade)
OR
Navigate(DetailsScreen; ScreenTransition.Fade)
Also, make sure DisplayMode property of button control is set to Edit.
Documentation: Navigate function in Power Apps
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