How to hide Data Saver icon in Status bar?
Using SystemUITuner, it is possible to remove to remove the data saver icon with or without root (need to grant permission through adb when the device is not rooted).


Open the app, click on TO THE TWEAKS. 
Select Status bar. Scroll to the Networking &amp; Data section, then disable Data Saver Icon.


Note: I performed the steps above on a non-rooted device with Android 8.1.

Disclaimer: I am just a user of the app not its developer(s) nor related to him/her/them.