I have an Android 7.0 phone with two users (OnePlus 3, Oxygen OS 4.0.3). The first user (as it was created first in order of time) seems to have more privileges than the second one. For example, the phone boots on the first user, he can tweak certain configurations that the second cannot, and some apps (WiFi monitoring for example) don't work on the second user and more.
I'd like to extend the privileges to the second user, or at least to switch the main one so that the second will become fully operational on the phone.
How can I do that?