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You need to increase the brightness for the screens via corresponding knobs. I tend to think that Fenix made a mistake here to dim all displays in the cold and dark panel state. The same happened to PMDG with their improved parking brake logic (to behave as in the real 737). There were several weeks of people asking why they can’t set the parking brake.
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Fenix app is unreliable, at least for me. Sometimes I also have blank screens after loading into a flight. Simple restarting of the Fenix app always helps.