The problem is exactly the same on my phone.
Is mikedom's problem solved ?

Sorry for the topic mistake!
Thanks for your answer. Yes, indeed, I use a custom ROM (Razodroid 2.5)

Is there a solution nevertheless ? Which system value is responsible ?
And I've seen another topic with the same problem, so maybe you can add mine at the end.
Thanks again.

Hello everyone. For a start, excuse my mistakes, english isn't my native tongue. I purchased FPse from google store for my Samsung GT-S5839i phone with Android. Everything work well, except that the virtual controller's buttons are too small. I tried to change the size to "very big" withou...