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I figured it out, replying to my comment so people in the future will know how to enable it.
On the right side on the screen there are 3 buttons, press the "+" button in the middle twice and select Gaming, save your settings and you should get a notification to enable freesync.
I have the same monitor and noticed that the picture looks washed out when enabling "Game" mode as compared to "Text" mode (I assume because the backlight is increased on Game mode). Have you found a way to get the picture of Text mode while still having Freesync available?