FACEBOOK APPLICATION IS JUST HIDDEN AND NOT TOTALLY REMOVED?

[schrodingerz-cat]

Samsung Galaxy J4+: <SM-J415FN/DS>

ISSUE
At first I thought that it is totally removed because it vanished once I checked app settings. But when I tried installing it again from Google Playstore, installation didn't consume any data and the app itself just instantly installed in a matter of seconds. I checked settings again and now I can't uninstall it despite removing it from UAD and the disable button comes back. Does this mean the app itself isn't entirely removed and just hidden on my device?

[VeH-c]

Hello, i suggest you read the FAQ to understated more about how UAD works. based on your experience i'd guess PlayStore simply enables the disabled APP, is the FaceBook APP that came with your phone is a System APP?(Scary if that's true)