I suppose you could have a text box on each sheet with that information, but in my opinion this is a wrong path to begin with. Qlik Sense is made to be responsive - users should be able to choose the zoom level they prefer. Also, users could have different screen sizes; my laptop has a 1920x1080 resolution, but I mostly work on a screen that's 2160x1440 or a 5K resolution screen. So when I develop apps, I need to make sure that the applications are working fine in all scenarios. There's no chance whatsoever that I personally would follow a recommendation of 100% browser zoom, and especially not the windows zoom factor of 150% (that's way too big for me), just because some qlik developers believe that I should to make their app look its best.
