As long as the screen is still secure and escape proof when in a vertical position, then I don't see why not (substrate leaking out the screen might be on issue though?).
I probably should have looked at your avatar before, but if this is for a gray tree frog, then a screen for a front in a conversion like this seems much better than glass- good ventilation is always recommended for tree frogs and grays aren't terribly fussy about having a high humidity.





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