What is this blue outline box?

[PhotoBoy]

Is this blue box a new guide to visually tell me two objects on the same layer? Or does it do something else? What do I do with it or how do I trun it off temporarily?

 

[BrettN · Accepted solution]

Without knowing more about your setup, my guess is you have Layer Edges on. You can turn this setting on and off from View > Show > Layer Edges. 

[PhotoBoy]

Thank you, BrettN

[Ares Hovhannesyan]

Please show your steps what are you doing. That can help to reproduce your action.