Hi @ابوعذاب1, welcome to our forum!
The Ultra devices do indeed have a bigger screen than some of our other devices! 
Would it be possible for you to elaborate a bit on your question, as I'm not quite sure that I understand it fully.
On the links below, you can read how you can change the font and display size!
https://support.sonymobile.com/global-en/xperiaxa1ultra/userguide/font-size/
https://support.sonymobile.com/global-en/xperiaxa1ultra/userguide/display-size/
Let me know if that helps!
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