How do I set my app to show p&l reports as cash figures rather than accrual?

Hello chris c1, Welcome to Quickbooks Community page,  the app is more for on-the-go things some things like looking at reports and drilling down on them needs to be done on the web version, unfortunately, what you are asking is not possible to do on the app version and therefore you will need to log into your account on the web in order to achieve what you are asking.