Can you provide the link that is called when you click on the item in SharePoint?
Is the app called with this link? If yes, is there a parameter passed at the end of the link in the following way:
...?MyParam=xxx
Then you could use this parameter in the App.StartScreen property
If(
!IsBlankOrError(Value(Param("MyParam")),
SecondScreen,
FirstScreen)
)
to navigate to the correct screen.
Otherwise you have to create a link that provides this parameter.
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