Freesync works on display side, not on GPU side. So it MUST be enabled on monitor and driver only tells either use or not use this mode for applications. If you disable Freesync on monitor, you won't be able even enable Freesync. Moreover... You could've googled topic by itself. Difference between Freesync and Freesync Premium (and Freesync Premium Pro) is different hardware capabilities for support, which are more like extensions on top of very basic Freesync default.
Also as i said, freesync must be enabled on monitor side. Toggles per game and under Display settings are for enabling usage of this synchronisation mode either globally or on per game basis. For per-game settings it exists so that user can decide if Freesync capabilities should be used with some specific game (like it runs only at locked 30 FPS, and lower range of Freesync premium is 48, so you better turn it off for such game.
See... It even have Display column dedicated for these settings...
Difference in single toggle in monitor settings
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If your wondering why I care to turn it on or off, since installing my new card I have had great performance but when playing a game I sometimes get a black screen for ~1sec.
It is either bad DisplayPort cable that is unable to handle interference
Flickering Issues With AMD GPUs? We've Got You Covered! Driver Settings And Choosing Proper Cables -...
Or result of current issues with vertical synchronisation and hw acceleration caused by process of adaptation to MPO (MultiPlane Overlay).
In this case fix is registry edit. You can find one either here (yes Nvidia began to have same issues about 2 years ago, and some people are even now can meet some problems):
Please... Google "461.09 mpo disable"... it should be first link.
OR just do that regit manually
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Dwm]
"OverlayTestMode"=dword:00000005
People report that it helped them with black screen issues and some other related issues.