Small size problem of pin code menu for large panels

[savaskorkmaz]

As you know, we can add pin to change some KNX values in visualization screen. We have an android panel which have 1200x800 resolution and we try enter pin code in numeric screen but that numeric screen is too small. You can see in attached picture. 
I would like to increase visual size of this numeric menu which I can enter the pin number.
How can i do it ?