Zoom out entire app

Hi! we have had an app running for about a year but one of the problems that we face is that the app needs to used always on 75% zoom. when on 100% everything is way too large. Is there a way to set a default zoom for the entire app so that we dont have to advise everyone to “use on 75% zoom”? TIA
1 answers

An option would be to implement: SASS Mixin, but I would solve it by redesigning the page templates, if possible, with some added css to shrink fonts, less margins etc.