What is this blue outline around my Roblox Studio's play test window?

I casually opened Roblox Studio and attempted testing my game when this blue outline appeared around the play test window. May someone tell me how can I disable this?

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As far as I know, its not something that you can enable/disable.
Restart studio if possible.

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Roblox recently added it so its easier to tell if you’re looking at the client (blue) or server (green).

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Where? In my knowledge, you arent able to

Hi, is there any solutions for disabling this yet?