Key font size in Android keyboard too small

Hi,

 

I changed to Samsung S6 with high resolution display.

 

Using Key as a keyboard type to get username/password. The text is so small that it is very difficult to read.  The text is now also using only part of the block in which it is located.

 

Is there anyway to change the font size? This is probably not a problem if you have good short range eyesight, but we who do not have that would also like to use Key.

 

Android 5.1.1, Key 4.0.1

 

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