What are those three camera (like) parts on fairphone 4's back?

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Hello everyone!

Do you know what are the three camera (like) parts on fairphone 4’s back?
I know two of them are normal lens and wide-angle lens, and the white small rectangle is the flash light.
So what does the third camera like part?

I want to DIY a phone protector with glue gun. Im not sure whether should I cover it with glue.

fairphone-back-annotate

That is a time of flight (ToF) Sensor that measures the distance of objects to focus correctly or create a blurry background. Better don’t cover it.

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