Strange screen problem - graphics details and marks

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A

AC Question

LG E430

Every time I turn on the phone a line of graphics position data appears across the top of the screen.

When I swipe across the screen, coloured lines appear.

If I press the screen, a circle with graphics data appears.

I first thought this must be caused by a particular app I've downloaded, but I've just opened in Safe Mode, and the same problem.
 
Welcome to Android Central! It sounds like a Developer Option. Go to Settings>Developer Options​ and see if anything is turned on there.
 

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