What is it and what does it do? (1 Viewer)

[rent]

There's this tab on the front window frame on OT+, OT (not plus) does not have it. What is it and what does it do?

 

[Orzel]

Have the same "tab" on our P+

 

[Bluegill]

I think that makes sure the window doesn't get out of line when it's rolling up.

 

[DaveK]

Licorice flavored chicklet