"When a mobile device is initially enrolled to MDM All the system applications duplicate in the app drawer(PFA screen captures)."
"The duplicated applications belong to a work profile, policies or restrictions only apply to the copy of the app in the work profile."
This happens when you use Android in BYOD mode. Android only offers one way to keep personal and corporate data separate - and that is by duplicating the applications and putting the corporate data in separate containers. If these are company owned devices you want to use "Device Owner" mode instead.