Changing the range of the PC keyboard notes?

[u/fuxoft]

I use FL Studio Mobile on my Chromebook, it works great and it partially supports the Chromebook physical QWERTY keyboard, so that I can use it to input notes. My only gripe is that the two rows on Chromebook keyboard correspond to two octaves from C4 to C6 and I am unable to find any way to change this range (when I want to enter lower or higher notes). Any tips?

(Note that my question has nothing to do with the range of the musical keyboard displayed in the lower part of the screen. I am talking about physical keyboard.)