Wise experts of League client: HOW the hell do I make that TFT yellow dot go away?

(No, I don't want to turn off ALL yellow dot notifications; ONLY the TFT one)

EVERY SINGLE TIME I launch the client, there is a yellow dot on the TFT tab. I check every item I can claim: they have been claimed already. I have clicked through all those childish conversations that you can have with champions. I have even checked my inventory. I am NOT going to buy the pass.

Still, after I close the client, EVERY SINGLE TIME there is a yellow dot on the TFT tab and it's driving me insane.

Where can I finally claim that hidden thing? What do I need to do to make it go away?