What's behind the plexi of the radio?

Most likely a totally stupid question, but does the plexi on the radio have any function?

I'm asking because my (second hand) Prius has a Parrot bluetooth kit and the remote is glued onto the lower plexiglass front (miniature glove compartment where some install the aftermarket radio).
When pushing its buttons (of the remote), the door sometimes flips open . Looks to me the radio would have been a far more logical choice for glueing this remote and I will try to see if I can get it off without breaking it and put it back 4 inches higher, on the radio...

But if I'm missing something, I'd obviously would like to know.

 

Thank you!

This is indeed exactly what got me wondering if I was missing something.

BTW: I don't have that aftermarket radio, I just have the small compartment still intact. Depending on the quality of the OEM radio, it may stay that way...

 

Here's what I have without going out to the car and take new pics
I will try to get some more pics tomorrow.

 

I've only had the Prius for a week (today), and have only made 1 or 2 calls.

I've been fighting a little with the bluetooth audio streaming and I read you can hook up two phones, but the option didn't show up...
Turns out I had to update firmware, which didn't work from a specific USB stick, but after a lot of hassle: it works now.

Pairing is easy, calls so far have been OK and the system *probably* works with its own amp, so that'll be a challenge to get to work with the OEM headunit and external amps. (I don't like speakerlevel converters and the switching may cause severe plops in the external 4x70Wrms amp I may put in...)

From what I've read I think it hooks up into the OEM wiring, switching the loudspeakersignal from the headunit OFF by switching a relay to its own amp's outputs (2x20W class D?) the moment you get a call. This means it can work with just about any radio, and the iPod+jack-plug+USB connector can play MP3's or headphone-outputs the same way (through the Parrot amplifier using the Parrot remote as a volume knob, so not the steeringwheel-buttons!!!)

So far: I'm satisfied.
My JVC headunit (bluetooth as well) in my other car keeps forgetting it is linked to my and my wife's phone so it's always a surprise if you'll have hands-free operation and can only handle one phone at a time I think. To be fair, it is from 2007 and can't be upgraded (firmware) so it is bound to loose out on functionality.

Parrot-remote (next to gearlever in pic) was missing the original knob, so replaced it with what I had lying around.



Switched ON and remote on the radio instead of on the fold-down-flap-to-the-mini-glove-compartment-thingy:



BTW: if you look at my glove-compartment, you'll see it is damaged and they cut a little piece out of the silver plastic: they had the iPod/USB/jack-plug dangling out of this 'hole' from the glove compartment. I found out why when hooking up a USB-stick with music: there is no way of switching it OFF I think unless you jank it out of the USB slot... Will investigate this further, as it looks very weird that this would be the case...