There is a small round sticker with a yellow stub on top of my Mavic Pro gimbal head.
I haven't removed it because at first it didn't come off easy. Is it there for some reason. If not, someone tell I won't break it peeling it off!

Hi, thank you for reaching DJI forum. You can remove it before flying, it will not void your warranty. Just make sure to remove it gently. If you have other concern, please let us know. Thanks for your support.

Like the other stickers you removed, it's there to protect the surface of the gimbal (in case it rubs against anything). When removing that sticker, make sure you hold the gimbal in your other hand firmly.