Default App grouping help


I am wondering if someone can help please?

I have an app that I use to control lighting in my home. The app has a slight flaw, whereby it only allows me to set a maximum number of groups to 4. I am wondering what would be the best way to see if I can increase the groups from 4 to say 5, 6 or even more?

I'm not an app developer by any means, but started learning a bit about it yesterday (using this forum) - apktool, decompiling, recompiling, signing etc.

I wouldn't be too sure where to look for this coding wise.

Would anyone be able to help with this?

Thanks in advance.