Sure, @lillian1n2 . The thing is that most of the datasets (at least in our testing servers) are shared publicly (see below) and therefore downloaded on Android. But if you would remove this public sharing it would reduce the amount of data being transfer.
Please, also consider the usage of Androi Settings WebApp to reduce/limit/define the amount of data you want to download on your devices. DHIS2 Android Settings Web App version 2.2.0 is released