First screen UI will have dropdown control with source as data page D_pzListOperators
Second screen flow action should be running on data page context D_pzOperatorDetails and have section configured in flow action to display all operator details with read only.
To make it more reusable - first have a section (say A) to display operator details and have another section B including section A with presentation as read only. Configure section B in flow action.
There are multiple ways to do your use case. This is one among it. Hope it helps.
You can use OOTB data pages to achieve this requirement
Screen 1. D_pxListOfOperators - To display the list of operators. Based on the selection, you store the value of the selected pyUserIdentifier in a property (SelectedOperator)
Screen2. D_pxOperatorDetails - To display the operator detail based on your selected pyUserIdentifier in the prior screen.