can anybody explain what this is on the dash and how do i turn it off many thanks

My guess would be Blind Spot Assist - green for all clear?

You can change what is displayed on the drivers display

The only time I get that symbol on the dash is when I engage sport mode.

The two green ‘arcs’ move towards the rear of the car image as I accelerate so I’ve always assumed it’s some kind of half-baked G meter (or whatever they’re called). Either way I find it completely pointless.