This question about the yellow tab goes both ways on what to do with it.
Some prefer to remove and some don't. Many who choose to remove state that is a bit difficult as it is stuck on very well. Be sure to take care and support the gimbal while removing as if you pull to hard can cause damage to the data cables above. For most though, state that it does not interfere the with operation of the gimbal and therefor leave it on.
Strictly your choice.
I'm guessing it is a tab to help in the installation of the gimbal/camera system at the manufacturing plant. I carefully removed all of it just because I thought it would impart a fraction of a fraction of motor imbalance. In turn overworkng the fragile gimbal and thus draining my battery prematurely. That was my thought, I know not why I do, I just do and know later.
PS: Later, I thought that maybe it's a Flag to draw the pilot's attention to the Gimbal Clamp, so we don't forget to remove it...
I need to link in more youtube videos. Mr. Homer found out about that problem about a month ago.
If you remove that plastic liner the gimbal top gets scratched up, but it does not harm the operation. I followed his advice and left mine on expecting the plastic liner might get scared and eventually peel away but so far it looks perfect.