New z play lcd assembly protective backer

Ready To put the new LCD screen assembly on my Moto Z play question is I tried to peel the tab off the back of the LCD it’s very difficult to remove it seems kind of thick I wondered if it was two layers I tried to separate the tab from the layers if I pull it all it’s like a mirror underneath if I separated it it’s black underneath the first layer , does this matter or how should it be should I leave the black on or peel it all off?