At times when I move my mouse the screen expands and gets larger print font, I have no idea what I am doing with the mouse, or better yet how to turn it back to normal
System preferences > Universal access > seeing
you have blundered into built-in aids for uses who want visual enhancements.
If the Control key is being pressed when you scroll, the screen will zoom. With some keyboards the Control key is at the lower corner, so it is possible to accidentally press it.
To unzoom, hold the Control key and scroll in the other direction.
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