When I touch the screen, instead of selecting item or text it magnifies it. Just a small area, not the whole screen.

The magnifier setting is OFF.

I suspect I've changed a setting somewhere while trying to make my toolbar/tabs bigger (unsuccessfully, but that's another story).

Not sure if this is a W8 issue, or chrome.

This is making my laptop almost unusable, I'd be immensely grateful for some advice.