How to toggle this off?

[forrest123123]

So I randomly join a server and this happened. How do I toggle this green thing and other shapes? 

 

[Urban Blackbear]

That looks like some kind of graphics setting with the lighting. Try playing around with those again.

 

[Beelzybub]

So I randomly join a server and this happened. How do I toggle this green thing and other shapes?

That is the "Show Lighting Perf." checkbox in the debug menu.