Mobile App Wrapped but Dimensions Do not Match Depending on Device

Dear friends,

I have been building a web application for my company for the last 3-4 months and it has been an awesome solution for our team. I have benefited vastly from the community finding issues on previous topics.

There is one issue that I could not solve and the sources I found on the forum did not work so far.

I have also built a mobile app using the same database and tested the app wrapping on different platforms (GoNative, DropSource and couple of more) but if the dimensions are perfect for instance for iPhone5, it does not look OK for iPhone 6, 7, 8.

I have tried different dimensions, tried to buid it responsive, tried fit to page, scaling etc but could not solve it.

Probably there is an earlier post that I am missing but I have spent hours on this and finally decided to ask for help. I would highly appreciate even a reference to a page, video or a post.

Thank you in advance.