The problem I am having here is that i am playing the demo version of Java Edition and I was thinking of buying it and I would but when I play the demo I can't do a full 360 turn and for that reason i can see my mouse on the side of the screen. Now note I am in full screen mode, and I tried looking everywhere in my computer settings and in the minecraft settings. So can you tell me if I am doing something wrong or just not the right compatible PC.

Thanks