What is this dangling circle pop up on my phone after update?

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Android Central Question

I have a s9+ and my phone did an update earlier in the week. I have not installed any new apps since the update but this morning I noticed a circle that dangles from a line at the top right of my phone that drops down randomly. I can't get it to go away and when I click on it random things pop up. I've had Fb show up and two random articles. I can't hold it down and get to setting, it doesn't seem to be linked to a certain app and it only stays for so long and then disappears. Can anyone help with this?