Only one user has this problem. He encounter problems in viewing the New Screen and the View Screen.
But all the other users do not have this problem.
And I suspect that on his PC, the connection to the behind SharePoint List Datasource is not established.
Hi @_jason :
I suggest you check if you have shared this SP list to this user.
I think this link will help you a lot:
Allow PowerApp users to submit data to sharepoint but restrict Sharepoint direct access
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