FreeSync will be turned OFF when users disable it from the Radeon Control Panel, or the AMD graphics card driver in other words.
It is normal that the monitor OSD data still shows Freesync On and it is because AMD graphic card is still sending signal with Freesync protocol while Freesync function if turned OFF (the fps is fixed). This is the behavior from AMD graphic card and it won’t affect the Freesync On/Off function.