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I have, still doesn't seem to work. Is it a mouse issue or game issue? And if it is a game issue how can I fix it?

Just bought this game, really enjoying it. However, it's really annoying that whenever I move my mouse the camera moves. I have to hold down the right click to stop the camera from moving. Is there a way to only move the camera with the arrow keys? Thanks (Also total noob, all this PC gaming is new to me)