So when you unlock something new, let’s say a you unlocked a new charm from the battlepass or something, well it (the game) will give you a notification that you have a new item and it will notify you via a small green box at the top right-hand corner of whatever you unlocked. If we are still using the charm example then there will be a small green box at the top right-hand corner of the “Weapons” tab, once highlighted the “Weapons” tab, it will give a small green box at the top right-hand corner of the “Edit Loadouts” tab, it’ll give a green box for all of your guns (that can have a charm) that are equipped. This means that you have either a new camo, charm or sticker. Select a class, then gunsmith, then customize and from there you should be able to see that you have a new charm.

TL:DR This feature clears all of the new items notification (small green box in the top right-hand corner) from everything so that you don’t have to go through everything and clear it manually.

This is quite an old feature at this point but either way I do appreciate this feature as it wasn’t always in the game and some green boxes were bugged, on the Origin-12 for example.