I eventually found the answer,
it might be interesting for someone else :
You need to go in the "Edit Account" : /Orion/Admin/Accounts/EditAccount.aspx
Then, in the following section, you need to apply the "Device Tracker Summary" view per account basis.
USER DEVICE TRACKER SETTINGS
User Device Tracker
However, in the Menubar, you need to add the default "Device Tracker Summary" view to make the menu visible.
And then, the view is overloaded by the account settings
Hope this help.