I have no info on WhatsApp as I don't use it myself, sorry.
Thanks a ton for responding really appreciate the concern. One more issue I came across that is camera app 48 mega pixel not working also macro lense not working shuts down the camera app, any fix for that?I have no info on WhatsApp as I don't use it myself, sorry.
As far as the grid size for the app drawer though, you cannot change that. You can modify the home screen grid, (Hold on the home screen > select "Styles & Wallpapers" > Then there will be a "Grid" option, bottom middle), but not the App Drawer.
The devs recommend using another launcher if you need/want to modify the App Drawer grid.
#include <std_disclaimer.h> /* * Your warranty is now void. * * We are not responsible for bricked devices, dead SD cards, * thermonuclear war or you getting fired because the alarm app failed. Please * do some research if you have any concerns about features included in this ROM * before flashing it! YOU are choosing to make these modifications and if * you point the finger at us for messing up your device, we will laugh at you. Hard & a lot. * */