Removed apps and users, Android OS uses too much data

I've noticed that Removed apps and Users uses too much data on the background. But dont know the reason. In this photo I can see that Removed apps and users, and Android OS uses too much data. How to reduce this usage? I know that Removed apps and users are use by my uninstall apps, disabled apps in the session. But if I use the uninstall apps then why this photo shows the the data used in foreground not in background .? Then how to reduce usage of Removed apps and users, and Android OS